190 NEW YORK STATE MUSEUM 



dd Not as above 



e Dorsum of each median abdominal segment marked with spines 

 of several sizes ; those in a transverse row near the anterior 

 and the posterior margins are most prominent 



32. nigricans n. sp. 

 ee The spines most conspicuous in two oblong patches beyond the 



middle of each segment 

 / The teeth of the comb of the eighth segment projects caudad, 



pl.22, figs. 15 and 16 43a. Var. aofmodestus 



ff Teeth of the comb of the eighth segment project laterad. 

 Markings on the abdomen resembles pl.22, fig.15, but covers 

 more area on the anterior segments 48. dux n. sp. 



Weyenbergh (1874) gives a few notes on the larvae of several 

 species, among others, C. nubeculosus, divers us, 

 riparius, annularis, chloris, virescens, and 

 tentans.- Of tentans only is a description given. Doctor 

 Dyar (1902) gives descriptions of larva and pupa of C. anony- 

 muiS Will. (No. 55). This description is in part reproduced on 

 a "subsequent page. 



Imagines 



Most of Say's and Wiedemann's species have been recognized and have 

 been placed in the following key. Of Walker's species only one or two 

 have been recognized and for this reason a separate key is given upon a 

 subsequent page for them: - 

 a Wings with spots or cross bands 



6 Dorsum of thorax polished black (burneri may be yellow) 

 c Humeral region of thorax tinged with yellow, wing with only a faint 



cloud 1. brachialis 



cc Thorax entirely black (var. of above?) 2. atrimanus 



6ft Dorsum of thorax not polished black 

 c Wings with spots 



d Each wing with about eleven spots ; brownish or greyish species ; 



3 mm. in length (New Mexico) 3. varipennis 



dd Wings not so marked 



e Thorax pale yellow, wing with four spots ; length 1.2 mm. 



Cuban species 4. octopunctatus 



ee Thorax brownish 



f Wing with three dark spots ; thorax indistinctly striped ; abdo- 

 men dusky ; length 2 to 2.5 mm 5. scalaenus 



ff Wing with five or six spots, or bars ; abdomen of female with 

 whitish posterior margins to the segments; length 2mm. 



(St Vincent Island) 6. spilopterus 



cc Wings with cross bars 



d Brownish species ; abdomen of female black with white posterior 

 margins to the segments ; length 2 mm. (St Vincent Island) 



6. spilopterus 



