OF PHILADELPHIA. 41 



with dusky hair; thighs uaked, blackish above near the tip; 

 tergum with a triangular white spot at the base of each segment 

 on each side ; each of these spots extends upon the venter in the 

 form of a band, interrupted each side of the middle ; thus form- 

 ing three spots on each series upon that part, the middle ones of 

 which are almost connected into a longitudinal line. 



Length one-fifth of an inch. $ . 



The white spots contrast strongly with the brown color of the 

 abdomen. 



CHIRONOMUS Meig. Wied. 



1. C. LOBIFERUS. — Segments of the abdomen with a lobe at 

 their bases. [13] 



Inhabits the United States. 



Antennae yellowish-brown ; thorax pale-cinereous, the three 

 lines testaceous ; scutel and metathorax testaceous ; wings white, 

 with a brownish obsolete point near the middle ; pectus testace- 

 ous ; feet pale yellowish ; tergum somewhat glaucous, the seg- 

 ments with their bases and obsolete longitudinal line black; on 

 the middle of the base of the second, third, fourth and fifth seg- 

 ments is a small longitudinally oval, slightly elevated lobe, ex- 

 tending nearly one-third the length of the segment. 



Length three-tenths of an inch. 



[Wiedemann has altered the name to C. lohifer. — Sacken.] 



2. C. FESTivus. — Body pale, when recent light green; pectus, 

 three thoracic lines and scutel testaceous ; wings white. 



Inhabits the United States. 



Body pale yellowish-brown, when recent, pale-greeu ; head at 

 base of the antennae testaceous ; antennee light brown ; eyes deep 

 black ; thorax trilineate with testaceous ; scutel testaceous ; wings 

 white, immaculate ; pectus testaceous between the two anterior 

 pairs of feet ; feet pale, haii'y ; thighs green ; tarsi dusky at the 

 incisures; anteriors nearly naked, with hairy tarsi; abdomen, 

 second, third, fourth and fifth segments tipped with blackish 

 above. 



Length of female, seven-twentieths of an inch. 



Observed particularly in the State of Illinois. 



3. C. MODESTUS. — Stethidium yellowish, abdomen pea-green. 

 Inhabits Pennsylvania. [14] 



1823.] 



