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Show 291 and from those received from the neighboring main ( the above and San Diego, Dr. E, Palmer), particularly in the narrowness of the dark mesial band of the hind wings, which nowhere even appears to meet the hinder margin, and in the obscurity of the marking of the tegmina. One specimen from Los Angeles has one antenna shorter than the other, and both mnch shorter than usual, although not broken; they were doubtless injured in early life and reproduced in an atrophied form; the apical joint of the longer antenna is half divided beyond the middle. SiM's limitation of the genus ( Edipoda, in his Recensio Orthopt.. I, forces us to consider GryUus carrulescens Linn., as the type, and not, as stated by Thomas, ( Edipoda Carolina ( Burm.). On this basis the genus is but feebly represented in the United States, and by species which differ considerably from the type. The nearest ally to ( Ed. ceeru-leacens is the species just recorded, in which the intercalary vein is much more closely approximated to the radials, the anal vein is connected with the axillary only by one of its branches, and the apical fourth of the tegmina is free from the intricate network of the middle of the same; the pronotal carina is also much more elevated anteriorly. Next in position to this group, in their relation to the true ( Edipoda, are, in this country, ( Edipoda Carolina ( Burm.) and ( Edipoda trifasciata ( Say), which are also included in the genus by Stal. The points wherein they differ, and npon which distinct genera should be based, will be given under the generic names DissostHra and Hadrotettix, next following. DISSOSTEIRA (( W<$ r, orelpa), nov. gen. This genus, of which GryUus carolinus Linn, is the type, differs from the true ( Edi poda, as represented by Grglln8 ccerulescens Linn., in the following points: The head is more prominent, the vertex being elevated and tumid; the antenna) of the male- do not thicken before, and taper at, the tip; the front of the fastigium terminates, as in Trimero-iropis, by an angnlate depression, and not by a straight transverse ridge; the vertex is somewhat broader between the eyes, and the latter in the male are rounder. The enlargement of the pronotum is wholly confined to the posterior lobe; thcmedian carina is greatly elevated, and that of the posterior lobe much arched; the metasternal lobes of the male are scarcely less distant than the mesosternal lobes. The tegmina are freer from the fine network of veins over a much larger part of the apex; all the veins are more prominent, and the anal vein is free from the axillary; the anal area of the wings is deeper, nearly or quite reaching the tip of the abdomen; the species are all insects of large size. In very many of these points it will hardly fail to be noticed that this group approaches much more closely the American than the gerontogeic section of ( Edipoda. ( Edipoda nebrascensis Bruh. and the following species also belong to this genus. 38. D% 8808teira longipennis {( Edipoda longipennis Thom.).- 1 <?, plains of Northern New Mexico, eastern slope, October 14- 31, Lieut. W. L. Carpenter. HADROTETTIX ( adpdc, rimf;), nov. gen. This group agrees with the typical ( Edipoda in the general structure of the tegmina, but differs in the comparative length of the anal area and the point of junction of the anal and axillary veins, and offers several other points of contrast; the whole body is stouter; the lateral foveolte of the vertex are obsolete; the antenna? are uniform in size throughout in the male, and in both sexes are longer and much stouter. The hind lobe of the pronotum is slightly tumid, the median carina nearly obliterated ( in which it differs strikingly from Dissosteira), and the lateral carinse obtuse; the metasternal lobes of the males, instead of being only half as far apart as the mesosternal lobes, are very nearly as far apart, much as in the females in both genera; the inferior carina of the bind femora is also much broader. 39. Hadrotietix trifanciatus ( GryUus tri/ asciatus Say).-, 1 $, Northern New Mexico, August to September, Lieut. W. L. Carpenter. TRACHYRHACHYS { rpaxp^ pdXt<;), nov. gen. Allied to Tr'dophidia Stal. Head pretty large, broadening very slightly below; summit more or less rugose : the space between the eyes equal to the width of the eyes ; the quadrate fastigium bounded by sharply- elevated carime, which run parallel to each other at the sides, but in front suddenly incline toward each other, but do not meet, leaving a deep sulcus between their separated tips; the fastigium is deeply depressed; lateral foveolse rather large, triangular, deeply hollowed; frontal costa suleate throughout, expanded slightly at extreme summit between the lateral foveol ® , just below it constricted, expanding again slightly at the ocellus, below which it is again, though very slightly, constricted, and then expands; eyes small, moderately prominent; antenna slightly depressed, a little shorter ( $ ) than the hind tibira. Pronotum moderately small, the posterior lobe a little longer than the anterior, the disk rugose, the median carina moderately high, equal, compressed, on the anterior lobe severed behind the middle, and the portion between the two sulci accompanied by closely- approximated, nearly as elevated, more or less irregular, subdorsal carinse, sometimes connected by a ridge with the median carina; posterior border rectangular |