84 ACADEMY OP NATURAL SCIENCES 



thighs beyond the middle, and near the tip annulate with black, 

 tibia black, somewhat pale towards the tip, tarsi black, of the in- 

 termediate ones pale on the terminal joint, of the posterior ones, 

 basal joint pure M'hite ; abdomen deep black, polished, venter pale 

 beneath on the middle segments. 



Length" of the body three-tenths, of the posterior feet less than 

 threc-tifths of an inch. 



The anterior pair of feet, when compared with the others, are 

 very short, and being extended before the head, considerably ele- 

 vated above the plane on which the insect moves, and also being 

 constantly vibrated, they assume the appearance of antennoe. The 

 whiteness of the anterior tarsi is very distinct and characteristic. 



This species occurred in the State of Illinois, it is also found 

 in Philadelphia. 



2. C. PALLIPES. — Black ; mouth, antennas and feet yellowish- 

 white. [98] 



Inhabits Missouri. 



Body black, elongated, slender ; front, antennte and mouth 

 yellowish-white; vertex velvet black, opaque, margined each side 

 by a silvery line : thorax with a whitish line each side before the 

 wings : nervures pale ; feet including the coxae yellowish-white. 



Length to the tip of the abdomen, more than one-fourth of an 

 inch. 



A much smaller species than the preceding. 



[This species is a Micropcza Meig. — Sacken.] 



LO:SOCERA Latr. 



L. CYLINDRICA. — Ycllowish-rufous ; feet paler. 



Inhabits Pennsylvania. 



Body yellowish-rufous ; head obsoletely varied with dusky be- 

 hind the vertex ; antennae fuscous, pale at base, beneath the head 

 whitish; thorax with an undulated band on the anterior margin, 

 dorsal line and an obsolete line before the wing, black ; vrings a 

 little dusky, particularly at tip ; feet whitish; abdomen immac- 

 ulate. 



Length less than three-tenths of an inch. 



Var. a. Lineatious of the thorax obsolete or wanting. 



About the size of />. ulincumonca Fab., but it differs from that 

 insect iji many characters, 



[Vol. 111. 



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