AQUATIC INSECTS IN NEW YORK STATE 395 
cand have a spine outwardly. The cuticular appendages have an 
unusual form, as has the labrum. The anterior part of the head 
is spiny. The armature of the end of the abdomen is peculiar. 
The posterior 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 which terminates in two 
paddle-shaped appendages, loosely ciliate outwardly. From 
Lake of the Isles near Minneapolis Minn. Herrick [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 cristallina Degeer (Tipula), Ins. 6:149, 20 
1787 pilicornis 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 (?) lateralis 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 
yellow with brown tips, basal joint brown; the hairs pale brown; 
the front, the upper surface of the proboscis, and the palpal 
joints brown; the incisures 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 
Jast, 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 with segments 
3, 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,” pair of 
verysmall pale yellowspots with a narrow brown border are more 
