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Show 220 INSECTA. ticulated palpi; the others inserted near the internal base of the preceding ones, resemble Uttle linea~ laminre, wh~ch are pointed and crossed at their extremity hke the mandibles of various Insects· they bear a greater similitude to the lancets of the sucker of the Diptera than to true mandibles( I). The head is also furnished with two large hemispherical, slightly pediculated, and granular eyes ; two almost filiform and short antennre, approximated at base on a common elevation, consisting of three joints, the two first of which are very short, and the third very long, and divided down to its origin into two long, compressed, lanceolate branches, laid one against the other. The ocelli are wanting. The form and divisions of the trunk are very similar to those of several Cicadarire, PsyJlre, and Chrysides. The abdomen is almost cylindrical, consists of eight or nine se'gments, and is terminated by pieces also analogous to those observed at the anus of the above mentioned Hemiptera. The six legs are almost membranous, compressed, nearly equal, and terminated by filiform tarsi com1>osed of four membranous joints with, as it were, vesicular extremities; the last is somewhat larger than the others and presents no hooks. The four anterior legs are closely approximated, and the two others thrown behind. The space on the pectus comprised between these latter is very considerable, and divided by a longitudinal furrow. The posterior extremity of the metathorax is prolonged over the abdomen in the manner of a large scutellum. The sides of that metathorax which give insertion to this last pair of legs are strongly dilated behind, and form a sort of inflated shield that defends the exterior and lateral base of the abdomen-. These Insects, in their larvre state, live between the ah· dominal scales of several species of Andrenre and Wasps of the subgenus Polistes. They frisk about with a simultaneous motion of the wings and halteres. Although they appear to (1) According tn Savigny, their month consists of n labrum, two mandibles, two maxill~, each bearing a very small uniarticulated pal pus. and of a labium without pal pi. , RIIIPIPTERA. 221 be. re~oved in several respects from the H . thmk It is to some of th I ymenoptera, I sbll ose nsects, such as the E 1 h. th they are most nearly allied. u op I, at ' M. Peck has observed one of the 1 v which is found on wasps It fi arvro-.Ll..enos Peckii- . orms an obion 1 · d · tute of feet, and annulated or pi . t d • h g ?va ' IS estiis dilated in the form of a h ;I e d t e anterior extremity three tubercles These la ea, ban the mouth consists of · rvre ecome nym h · h place, and, as it appeared to me when e . ~ s Inh t e same of th Xi R xanumng t e nymphs . e enos ossi, another Insect of the sam d . . their own skin, and without changing their fo::tl er, Within r, IN atre has per~aps furnished the Rhipiptera wfth the two a see ytra of which we have spoken, to enable them to d" engage themselves from between the abdom. 1 I ISInsects on which they have Jived ma sea es of the Th ~y· ar; ~sort of fEstri to Ins' ects, and we shall soon find :~foe;I:: ~f th:n.;Io~~tt undergoes its metamorphosis i~ the The Rhipiptera form two genera. STYLOPs, Kirb. The first one observed and instituted b M . branch of the last segment of th y .• Ktrby. The superior joints. The abdomen is retr t:lantednnflre lS composed of three little B . . ac 1 e an eshy. uta smgle species is known; it lives on the Andren:£. XENos, Ross. Here the two branches of the t . . domen, with the exce t' ~n ennre are marttculated. The ab-tractile, is corneous. p wn o the anus which is fleshy and re- Two species of this genus are known . . the Wasp called gall'c d ' one of which hves on 1 a, an the other 0 1 of North America the Poz· t f n an ana ogous Wasp . ' ~s es ucata, Fah.(2) rin{el, )S Feno.r some observations on th"1 8 Insect, see a very good Memoir of M. Jo- (2) See the Memoir of M · Kirb y, L'm . Trans., XI. |
