AQUATIC INSECTS IN NEW YORK STATE 395 



and have a spine outwardly. The cuticular appendages have an 

 nnusual form, as has the labrum. The anterior part of the head 

 is spiny. The armature of the end of the abdomen is peculiar. 

 The positerior rudimentary appendages are of a different form, 

 and the claws are replaced by club-shaped bodies. A curious 

 appendage below is indicated in the name. The pupa has an 

 extraordinarily elongate abdomen Avhich terminates in two 

 paddle-ishaped appendages, loosely ciliate outwardly. From 

 I;ake of the Isles near Minneapolis Minn. Merrick [loc. cit] 



Corethra plumicornis Fabricius 

 Plate. 39 

 Ent. Syst. 1794. 4:246-58 

 The following synonymy is according to Schiner, Fauna Aus- 

 triaca, 1864. 2:624. 



1776 crista llin a Degeer (Tipula), Ins. 6:149,20 



1787 pi 1 i CO rn i s Fabricius (Tipula), Mantissa Ins. 2:325-49 



1788-98 hafniensis Gmelin (Tipula), Syst. Natur. 2826, 108 



1794 plumicornis Fabricius, Ent. Syst. 4:246-58 



1809 (?) la terali s Panzer, Fauna Ger. 109:16 



1818 plumicornis Fabricius, Meigen, Syst. Beschr. 1:15. 1 



1864 plumicornis Fabricius, Schiner, Fauna Austriaca. 2:624 



C. plumicornis, var. americana 



Male. Reddish brown; abdomen yellowish; the antennal joints 

 TellO'W with brown tips, basal joint brown; the hairs pale brown; 

 the front, the upper surface of the proboscis, and the palpal 

 joints brown; the incisrares of the latter yellow, the vertex, the 

 cheeks and the underside of the proboscis and neck pale yellow; 

 thorax pale brown above with three dark reddish brown stripes, 

 the middle one divided by a fine, pale brown line; the lateral 

 stripes abbreviated anteriorly, the median one posteriorly; the 

 pectus and the margins of the pleural and jugular sclerites red- 

 ■dish brown; scutellum pale brown, metathorax dark brown; 

 abdominal segments subequal in length except the first and 

 last, which are less than one half of the others. The dorsal 

 surface is brown with pale yellow incisures. The brown col- 

 oring is darkest anteriorly, gradually becoming paler caudad, 

 so that the posterior margin of the segment is almost as light 

 in color as the incisure. This is particularly true M'ith segments 

 U, 4 and 5. On segment 6, 7 and 8 the brown color is almost 

 wanting excepting a triangular lateral spot which is prolonged 

 caudad in a fine line. The outline of this spot, however, is not 

 distinct, but is blended in with the color of the dorsum. A pair of 

 very small pale yellow spots with a narrow brown border are more 



