I 



OP PHILADELPHIA. 349 



CHIRONOMUS. 



C. T^NiONOTUS. — Stethidium green, trillneate; a black line 

 on the middle of the anterior line. 



Inhabits Indiana. 



Body bright pea-green : head yellowish, terminal joint of the 

 antennae blackish : thorax with three dilated, pale honey-yellow 

 vittae ; a black line along the middle of the anterior one : wings 

 white : metathorax pale honey-yellow, with a blackish spot in 

 the middle, divided by a green line : tergum [150] immaculate j 

 pectus pale honey-yellow : feet pale greenish, anterior tibiae and 

 tarsal incisures dusky. 



Length more than one-fifth of an inch 9. 



C. DEViNCTUS. — Tergum black, incisures white ; feet with 

 black incisures. 



Inhabits Indiana. 



Body dusky : stethidium dusky livid : thorax trilineate with 

 blackish : scutel dull honey-yellow : halteres and wings white : 

 tergum brownish-black ; incisures, particularly those near the 

 base, white : thighs black, anterior pale at base ; the others with 

 a white annulus near the tip : tibiae and tarsi white, with black 

 incisures. 



Length nearly one-fifth of an inch. 



CERATOPOGON Meig. 



C. SCUTELLATUS. — Black J scutel yellow; abdomen whitish. 



Inhabits Indiana. 



Head blackish : mouth yellow : thorax pale yellowish, with 

 three black lines, which are widely dilated before, and confluent : 

 scutel yellow : wings dusky : poisers white : abdomen whitish : 

 feet whitish. 



Length nearly one-twentieth of an inch. 



Appeared in considerable numbers on the last of August, soon 

 after sunrise. 



LIMNOBIA Meig. 

 L. LIVIDA. — Tergum livid, with a yellowish margin. 

 Inhabits Mexico. [151] 



Head yellowish -brown, with a longitudinal fuscous line : antennae 

 1829.] 



