394 NEW YORK STATE MUSEUM 



Appendages over the labrum lanceolate and four or five times 

 ■as long as wide, ventral comb of last segment with 21 hairs 



(Em-opean) pallida 



4 " One of the four antennal bristles markedly shorter than the 



rest " plumicornis (Europe) 



The four antennal bristles of equal length; anal segment with 



four dorsal hairs plumicornis, var. americana 



The larva of C. t r i v i 1 1 a t a described by Dyar in N. Y. Ent. Soc. 

 Jour. 10:201 is said to have but 2 dorsal hairs on anal segment. 



Pupae 



" Extraordinarily elongate abdomen which terminates in two 

 paddlelilie appendages, loosely ciliate outwardly "..appendiculata 



Abdomen of moderate length, see figure; paddles with short cilia 

 on the inner margin plumicornis 



Imagos 



1 Wings with dark markings (2) 



Wings unmarked (4) 



2 Wings with several cross bands. Length of insect l.omm. . . . 



Corethrella b r a k e 1 e y i 

 Wings with numerous dark spots (3) 



3 The apex of both femora and the tibiae, and the base also of 



the tibiae, black, antennae with subfuscous hairs. Length 



4.5mm trivittata 



Legs punctate with numerous small brown spots. Antennae 



with yellowish hairs punctipennis 



4 Yellowish white species; legs white and spotless albipesn. sp. 



Pale brown or reddish yellow species plumicornis 



Judging from the description, the larva of ap p e n d i c u - 

 lata differs greatly from all the known Corethra larvae, and 

 F. Meinert in De eucephale Myggelarver says in regard to its pupa 

 that the figure given by Herrick resembles that of a Chironomid 

 rather than a Corethra. In the same paper Meinert expresses 

 the opinion that f u s c a is but a darker variety of plumi- 

 cornis; and attributes the differences in the larva to an error 

 of Staeger, assruming that the latter described some other 

 species. 



Corethra appendiculata Herrick 

 Minn. Geol. Nat. Hist. Sur. 1884. p.l9, pl.5. 



The adult not bred. Larva as follows: 



Form is more slender than plumicornis. The tracheal 

 vessels are of a different form and color, and viscera have obvi- 

 ous differences. . . Shape of the head is slender and attenu- 

 ated toward insertion of the antennae. Antennae are shortish 



