1902.] NATURAL SCIENCES OF THILADELPHIA. 69 



Clypeus flat, lougitudiually striated; dorsuhun not spotted, 



striatus ?, 



1 9. Autennre longer than head and tliorax united, slender, 



longicornis c?. 



Antennae shorter than head and thorax, the flagellum more or 



less clavate, • ^^ 



20. Clvpeus black medially, deeply punctured, with a carina on 



each side, ending in a sharp tooth, . . . inmitatus cT- 

 Clypeus entirely yellow, not carinate, the apical teeth blunt, 



driatus cf. 



21. Pronotum and legs in part (sometimes the head) reddish, 



riifomffmus ?. 

 Pronotum, legs and head black, maculated with paler, 



relativus ?. 



22. Form broad and short, the thorax subquadrate; middle seg- 



ment without a horizontal surface medially, .... 23 



Form elongate; thorax elongate (dorsulum longer than broad) ; 



middle segment with a Avell-developed horizontal surface 



bearing a serrated ci'ista, 25 



23. Abdomen Avith yellow fascia, -24 



Abdomen immaculate, with dense sericeous gray pile (wings 



blackish along costa; pronotum with the fore and hind 

 margin, and postscutellum broadly, pale yellow), 



sericeus ?. 



24. First segment of abdomen margined with yellow; wings yellow- 



ferruginous along costa, the costal and subcostal nervures 

 of the same color; medial clypeal tubercles smooth and 



shhiing, chapadce ?. 



First segment of abdomen not fasciate; wings fuscous along 

 costa, brownish in costal cell, the costal and subcostal ner- 

 vures dark; medial clypeal tubercles feeble, not shining, 



corumbce 9. 



25. Abdominal segments 2 and following broadly fasciate with 



bright yellow; wings yellow-ferruginous, dusky apically; 

 pilosity of head and thorax pertaining to golden, 



serratus c^. 

 Abdomen entirely dark, 26 



26. ^Viugs black, apical third pale, followed by a fuscous apical 



margin; clypeus pyriform, nuich longer than broad in the 



? ; thorax immaculate, subapicalis ? cf . 



Wings dark fuscous mingled witli paler on basal half, the 

 remainder subhyalinc; clypeus rather hexagonal, not much 

 longer than broad; posti-cutellum and miildle segment, or 

 the latter only, more or le.ss yellow; abdomen Avith griseus 

 pile, griseus 9 cf. 



