320 INSKCTA. 



pointed rostrum. The wings are incuxnbent. The larvae live in ve- 

 getable galls *, 



PsvcHODA, Lat., Meiij., 

 Without any tuft or bundle of hairs on the antennae; wings tecti- 

 form and furnished Avith numerous nervures. 



The front of the thorax, in one species of this subgenus, has 

 two appendages which appear to us to be formed by the lateral 

 extremities of its first segment f . 



Cecidomyia, Meig., 

 Where the antennae, like those of the Psychodas, are granose and 

 simply furnished with short, verticillated hairs, but where the wings 

 are incumbent on the body, and present but three nervures \. 



Other species, still of the same division with those in which the 

 antennae are slender, and manifestly longer than the head, are also 

 destitute of ocelli ; but the eyes are entire, and oval or round. The 

 wings, distant in several, always present membranous nervures 

 united transversely, at least in part, and closed, discoidal cells. The 

 anterior extremity of the head is narrowed and prolonged in the 

 manner of a rostrum, and frequently exhibits a pointed projection 

 underneath. The palpi are usually long. The extremity of the 

 tibiae is spinous. 



Several of the larvae live in mould, decomposed trees, &c., and 

 have no distinct thorax, nor false feet, but present two more appa- 

 rent openings for respiration at the superior extremity of the body. 

 The nymphs are naked, Avith two respiratory tubes near the head ; 

 the margin of the abdominal annuli is spinous. 



This subdivision comprises the largest species of Tipulae, those 

 called couturier es, tailleurs, &c., or our Tipulaires terricoles. 



In several the wings are always extended, the antenntc of the 

 males are usually bearded, pectinated or serrated; the ])alpi are 

 composed of five joints, the last of which, extremely long, seems to 

 consist of several smaller ones, or to be knotted. Such are the fol- 

 lowing subgenera. 



Ctenophora, Meig., 

 Where the antennae are filiform, pectinated in the males, granose 

 or serrated in the females. 



C. pectinicornis ; Tipula pecUnicornis, Fab. The abdomen 

 fulvous, with black spots on the back, and yellow streaks on 

 the sides ; Avings marked Avith a black spot §. 



* Lat., and Meig., and the Monograph of M. Fallen. 



t Lat., and Meig., Ibid. 



+ Meig., Dipt., I, 93. See also the Jour. Ac. Nat. Sc. of Philad.,pct. 1817. 

 M. Macquart — Dipt, du nord de la France — places his new genus Lestremia di- 

 rectly after Cecidomyia. The antennae ave hairy, curved forwards, not quite so long 

 as the body, and composed of fu'teen globular joints, pediculated in the males. The 

 legs are long and slender, and the first joint of the tarsi is elongated. The Cecidomyia 

 desfrucfor, described and figured in the above journal, may, very probably, belong to 

 this new subgenus, as the antennas seem to indicate. The Macropeza: are also closely 

 sdlied to these Diptera. 



§ Lat.. Gen, Crust, ct Insect., TV, 254 ; Meig., Dipi^.. T, 165. 



