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Show 242 INSECTA. . De Geer, is very common S l t 'narum; Tipula latrmarum, . art . tumn(l). in privies, particularly m au PENTIIETRIA, Meig. ted in both sexes. The legs Where the eyes are entir~ and separa are long and destitute of spmes(2). DILOPHUSt M e·l g. -Hirtea, Fab. 'b' s• the eyes are contiguous F merly confoun d e d W'lt h the Bt lohn e ' f 11 1 head. A range o sma or cu nearly the w o e .. in the males and oc PY 't of theit• anterior tlblre(3). . . ines crowns the extreml y 1 T' ularire have but elght or mne spy· lly the last of the flora lp . in which they consist of wa ' Those species, joints in theit· antenn~~ c lindrical and perfoliate club, compose m. ne, ~,, ot·ming an almo y the subgenus BIBIO, Ge0 .lal:o• Meig.-Hirtea, Fab. ts fl but seldom and remain a long The Bibiones are heavy Insec ' Y. the gardens of France, have Y common m h time in coitu. So~e, ~er. the time of their appearance; sue eived names wluch mdtcate h d StJean. The two sexes rec d St Marc Moue es e are the Mouches e ' 1 . as is observed in the very often di·f fer grcat lyastocooul t, L the female; F.• marct', L. , B. hortulana; Tipula !tort~ ana, ~he male is all black; the the male; Geoff., Ins., II, XIX, 3.d her abdomen yellowish-red, thorax of the female is a cherry~re Very common on flowers in and the rest of her body blac . the spring. . the buds of plants. Their It is thought that these Insects gdnaw h'lls and have little ranges . d rth and ung- 1 ' ( ) larvre inhabit cow ung, ea ' not enclosed in cocoons 4. of hairs on theit· annuli. Their pupre are (l) Lat., Meig., Fab. (2) See Meig. (3) Meig., Ibid. (4) See Meigen. I' I DIPTERA. AsPISTEs, Hoff. Meig. The only Insects of this rlivision which have but eight joints in the antennre, the last forming an ovoid club( 1 ). All the following Diptera, a small number excepted, have their antennre composed of three joints, the first of which is so short, that it may be excluded ft·om the supputation; the last is annulated transversely, but without distinct divisions. It is frequently accompanied with a seta, usua1ly lateral, and situated on the summit in others, presenting two joints at base, sometimes simple, and sometimes silky. When this seta is terminal, it frequently happens that its length diminishes ar•d its thickness increases, so that it has the form of a stilet. Although this piece may be considered as a continuation of the antennre, yet as it is separated from them, and appears to constitute an appendage, to deviate from the course generally adopted, by adding to the ordinary number of the antennre those of the seta, would only disturb the harmony of our nomenclature. The palpi never have more than two joints. Some, a few excepted, whose larvre divest themselves of their skin previous to becoming pupre, always have a sucker composed of six or four pieces ; the proboscis, or at least its extremity, that is to say, its lips, is always salient. The palpi, when they exist, are exterior, and inserted near the margin of the oval cavity, close to which arises the sucker. The larvre, even of those in which the skin forms a cocoon for the pupa ( Stratiomis), retain their primitive form. This subdivision will comprise three families. (1) Idem. .. |
