INSECTS. 377 



a. Antennae of the males plumose, or with a bundle of hairs ; those of the females 

 hairy. 



1. Culiciformes. 



* Antennas of the males plumose on both sides, and to the end. 



| Antennae entirely composed, in both sexes, of oval cylindrical joints. 

 Gen. CORETHRA. 



{"{ Antenna? of both sexes moniliform inferiorly, terminated afterwards either by a 

 long and linear joint, or by two joints, of which the last is tumid and oval. 

 Gen. CHIRONOMUS, TANYPUS. 



** Antennae of both sexes almost entirely moniliform, with the last five joints more 

 elongated ; those of the males having but one bundle of hairs at their base. 

 Gen. CERATOPOGON, MACROPEZA. 



b. Antennae of both sexes moniliform, furnished with verticillated hairs, or simply 

 pubescent. 



2. GallicolcE. 



Gen. PSYCHODA, CULICOIDES, CECIDOMYIA, LASIOPTERUS. 



B, Palpi in many long, and the last joint elongated ; anterior extremity of the head 

 narrowed and prolonged into a rostrum, often with a projecting point ; wings of- 

 ten distant, with numerous nerves, united transversely, at least in part, beyond 

 the middle of their length ; two or three discoidal closed areolae ; eyes round or 

 oval, without remarkable notch ; extremity of the legs spinous. Species generally 

 large, the greater part living in the larva and pupa state in the ground or in rot- 

 ten wood. 



3. TerricoloE. 



a. Antennas of at least thirteen joints, sometimes bearded, pectinated, or serrated, 

 in others more or less moniliform or knotty, and furnished with verticillate hairs. 



* Last joint of the palpi very long, and as if nodulous or jointed ; antennae often 

 bearded, pectinated, or serrated ; wings always extended. 



Gen. CTENOPHORA, PEDICEA, TIPULA, NEPHROTOMA. 



** Last joint of the antennae scarcely longer than the others, not knotty ; wings ge- 

 nerally resting on the body. 

 Gen. RHIPIDIA, LIMNOBIUS, ERIOPTERA, POLYMERUS. 



b. Antennae of ten joints at most, slender or capillary, simply hairy or pubescent ; 

 hairs not sensibly verticillate ; palpi and wings as in last division. 



* With wings. 



Gen. TRICHOCERA, M(EKISTOCERA, DIXA, HEXATOMA, NEMATOCEBA. 

 ** No wings. 



Gen. CHIONIA, Dalman. 



2. Two or three ocelli ; eyes generally round, the odd ocellus the smallest ; antenna? 

 simple ; last joint of the palpi never very long or knotty ; wings resting on the 

 body ; spurs on the legs. 



4. Fungworoe. 



A. Antennae not perceptibly granulated or perfoliated. 



a. Antennae longer than the head and thorax, capillary. 



Gen. MACROCERA, BOLETOPHILA. 



b. Antennae not longer the head and thorax. 



* Two ocelli. 



Gen. SYNAPHUS, MYCETOPHILA. 

 Three ocelli. 

 Gen. LEIA. 



B. Antennae either granulated, nodose, or perfoliated. 



a. -Antennae of the same thickness, or slenderest towards the end. 



