5t ACADEMY OF NATURAL SCIENCES 



short prostrate huirs ; pectus color of the thorax, downy ; feet 

 dusky; tibia white with the exception of the [33] tips; wings 

 slightly dusky, immaculate, nervures brownish, immarginate; ab- 

 domen blackish-brown, incisures cinereous. 



Length of the body more than two-fifths of an inch. 



Smaller than T. Uncola. 



3. T. STYGius. — Violet-black; thorax pale chestnut. 



Inhabits Arkansa. 



Hypostoma and front dirty yellowish ; antennae and palpi 

 black, callous of the front quadrate, chestnut, with a simple 

 slightly dilated line above ; thorax with five cinereous lines ; scu- 

 tel pale chestnut ; wings ferruginous, with three fuscous spots^ 

 abdomen immaculate ; tibia dull chestnut at base. 



Length nearly nine-tenths of an inch. 



CHRYSOPS Meig. Latr. 



C. QUADBiviTTATUS. — Cinereous ; tergum with four series of 

 brown lines. 



Inhabits near the Rocky Mountains. 



Length to the tip of the abdomen nearly two-fifths of an inch. 



Body cinereous ; head with three black frontal spots placed in 

 a transverse series, the intermediate one smallest, and a larger 

 black spot above the antennae; antennae dark reddish-brown, ter- 

 minal joint black at tip ; thorax blackish, with five narrow, cine- 

 reous lines; wings with a large costal spot, anastomosis and ob- 

 solete spots fuscous; feet yellowish-brown, [34] tips of the tibia 

 and of the tarsal joints black; tergum with four series of fus- 

 cous abbreviated lines, the two dorsal series approximate, the 

 lateral ones distant, between the dorsal series tinged with yellow- 

 ish-brown. 



LEPTIS Fab. Meig. 



1. L. ORNATA. [Ante vol. 1, p. 26.] 



Length % nine-twentieths of an inch. 



This species resembles L. thoracica Fabr., but the wings are 

 not obscure as those of that species ; the thighs as well as the 

 tibia are pale, the bands of the tergum are much broader, the 

 thoracic hair difl'erently colored, and the hypostoma and front 

 arc covered with silvery hair. 



[Vol. in. 



