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Show 482 INSECTA. catecl at the end and do not cover the posterior extremity of th abdomen. The maxil~a:y palpi are salient, and -tet:minated by : larger and triangular JOlDt. The legs are short. This genus does not belong to the Tctramera, as I formerly thought, but to the Rete· romera. The penultimate joint of the tarsi is bilobate. I have established this division on an Insect, found in Scotland in a shop, which was sent to me by Dr Leach. ' The second tribe, that of tlie PYROCIIROIDES, approaches the first in the tarsi and the anterior elongation and nanowing of the body, but it is flattened, and the thorax is almost orbi· cular or trapezoidal. The antennre, at least in the males, are pectinated or plumous-en panache; the maxi11ary palpi are slightly serrated, and terminated by an elongated and almost securiform joint; the labial pal pi are filiform; the abdomen is elongated, entirely covered by the elytra, and rounded at the extremity. These Heteromera, which are found in the spring in woods, and whose larvre live under the bark of trees, form the genus PYROCIIROA, Geoff. Fab. Dej.-Lampyris, Lin. Those species, in which the antenn<£ are almost as long as the body in the males, and give off long bearded filaments; where the eyes, in the same sex, are large and approximated behind; where the thorax is in the form of a tt·uncated cone, or is trapezoidal; and, finally, where the body is proportionally narrower and more elon· gated as well as the legs, constitute the genus D ~NDROIDEs, La t.-Pogonocerus, Fisch.( 1) Those, in which the antennre are simply pectinated and shorter, in which the eyes are remote from each other, and the thorax is almost ot·bicular and transversal, form the genus PYROOHIWA properly so called(2). In the third tribe, that of the Mon.DELLONlE, so far as re· ( 1) I had established this genus on an Insect ft·om Canada, which formed part of the collection of M. Bose, that closely approximates to the Pyrochroa ftabe//ala, Fa b. M. Fischer has made the same generic section, under the denomin!ltion of Pogonocerus, from a second spccies-tlwracicus-discovered in southern Russia. Th,c figUL·e of it, given by him in the Mcm. of the Nat. of Mosc., is rept·oducedin the first volume of his "Entomog. Imp. Russ. (2) See Geoffroy, De Gcer, Fabricius, Latreille, Schamherr, &c. COLEOPTEUA. 483 spects the form of the joints of the ta' rsi a11d ofth e1· r ho o k s, and of that of the antennre and palpi ' we find no comm·o n an d con-sta. n t character. These Insects ' however ' ar e east·1 y dI' stm. - gmshed from othe.r Heteromera of the same ~.a m· i·1 y,· 1> y the gen• eral conformation• of their body wh' 1'ch I·S e1 e vate d and arcuated; the head IS low, the thorax trapezo1'da 1 or sem·i c·i r-cular,. and th•e elytra are very short or· narroweu d t · 1 • , an ermi-nate m a pomt, Ike th~ ab~omen. Several of these Insects appr.o ach the Pyrochr01des. m the.i r antennre •, oth ers, b y t he ·i r m.a xt.ll ::e, the Nho oks of their tarsi and parasitica< l h a b1't s , ap-p~ ximate :o e.mognathus and Sitaris, subgenera of the last tnbe of tlus family; but they are removed both fr'om the former and the latter, by their extreme agility and the firm and solid nature of their teguments. · They form the genus McmnELLA, Lin. In some, the palpi arc almost of equal thickness throughout. The antenn<£ of the males are strongly pectinatecl, or fiabelliform. Th.e ext.remity of the ~andibles is unemarginatcd. The joints of the tat'Sl arc al~vays enttr<>, and the hooks of the last one are dentated or bifid. The middle of the posterior mat·gin of the thorax is always strongly prolonged backwards, and simulates a scutellum. The eyes are not emarginated. The lat•vre of some of these Insects -Ripiphori-inhabit the nests of certain "Vasps. . RIPIPHORUS, Bose. Fab. Theil· wi'ngs are extended, reaching beyond the elytra, which are the )ength of the abdomen; the hooks of the tat·si at·c bifid; the an. tenure, inserted near the inner edge of the eyes, arc pectinated on both s.ides in the males, serrated, or with but a single range of short t~eth m the females. The tet·minallobe of the maxillre is very long, ~~ed~r, and salient, and the Fgula equally elongated and strongly Certain naturalists have found several living specimens of the R1'P 1.P h v rus paradoxus in the nests of the Common Wasp, which led to the opinion, that they had lived there in their larvre state. According to an obset·vation of M. Farines, however, communicated to Count Dejean-Ann. des Sc. Nat., VIII, 244-the larva of the R. |