MAY PLIES AND MIDGES OF NEW YORK 99 



Another aberrant form, C. m n r i n u s Winn, is noted by 

 G. Gerclve on p.161, Wiener Ent. Zeit. Vol. 5. The larva was 

 not observed, but the pupa, although of an aquatic form, gave 

 rise to a hairy winged adult. The respiratory trumpets of this 

 species are quite peculiar. They are elongate, cylindrical, and 

 then suddenly contracted on the apical third. An Ithaca, N. Y., 

 specimen, bred from the slender snake-like aquatic larva, also 

 gave rise to a hairy winged adult. The larval skin was unfor- 

 tunately lost. The pupa has a cylindrical breathing trumpet 

 resembling the one described by Gercke. 



The imago. The imagines of the group Ceratopogon are 

 very small flies, commonly called " punkies," which differ from 

 the other genera of this famih' in having more robust legs, in 

 their wing venation, and in their not having the thorax projecting 

 over the head. To this group belong the genera Ceratopogon 

 sens, str., Culicoides, Bezzia, Brachypogon, 

 Ceratolophus, Palpomyia (with its subgenera A 1 a - 

 sion, Sphaeromias, Serromyia and H e t e r o m - 

 y i a) , and probably Oecacta, Psychophaena, Tetra- 

 p h o r a and Didymorphleps. 



Head flattened in front; epistome slightly projecting; palpi 

 four-jointed, the second joint longer or thicker than the others, 

 the fourth almost as long as the second; proboscis somewhat pro- 

 jecting; formed for biting; antennae elongated, filiform, 14- 

 jointed, the first joint annular, the following eight spherical or 

 somewhat annular; in the male long plumose, in the female with 

 few hairs, the last five joints in both sexes elongated, especially in 

 the male, and furnished with short hairs; eyes reniform, the 

 ocelli wanting. Dorsum of the thorax very convex, scutellum nar- 

 row, metanotum short. Abdomen eight-segmented, rather long, 

 sometimes narrowed bn sally. Genitalia somewhat prominent. 

 Legs moderately long and quite robust; especially the femora, 

 which are often furnished with spines or setae; tibiae sometimes 

 flattened ; tarsi various, the claws with or without teeth or setae. 

 Wings bare or hairy, folded over the back when at rest; the media 

 simple, the cubitus always two-branched; wing venation of the 

 types shown on plate 17, figs. 13 to 16; halteres distinct and 

 uncovered. 



Genus 3. Ceratopogon sens. str. (Kieffer) 



Btil. Soc. Ent Fr. 69. 1899. Ceratopogon Meigen pt. (1803). 



(P1.18, fig.7) 

 Wings long-haired, especially those of the female. Last joint of 

 the tarsus with very apparent and hairy (not setose) empodium. 



