1893.] NATURAL SCIENCES OF PHILADELPHIA. 537 



Clypeus distinctly rounded-out, not emarginate or dentate ; 

 first joint of flagellum distinctly longer than the second ; abdo- 

 men entirely red; $ unknown Cockerellii. 



1. — Plenoculus Davisii Fox. 

 P. Davisii Fox, ibid. p. 554. 



9 . — Anterior margin of clypeus deeply incised, armed with fine 

 small teeth on each side, the outer and inner tooth is usually the 

 largest, the others being sometimes indistinct; first joint of flagellum 

 shorter than the second ; dorsulum and scutellum minutely punctured, 

 the latter strongly convex ; upper surface of metathorax coriaceous 

 or finely granulated, with a longitudinal, medial, impressed line, and 

 at the extreme base with a transverse series of short stria ; the meta- 

 pleurse delicately striated; legs tolerably spinose ; pygidial area 

 strongly and sparsely punctured, triangular. Black; mandibles, 

 except tips, tegula?, tibia? and tarsi more or less, yellowish ; abdo- 

 men with the segments broadly testaceous on apical margins, the 

 last segment reddish at tip ; front, face, clypeus and thorax densely 

 clothed with silvery pubescence ; abdomen with silvery pile ; wings 

 hyaline, iridescent, nervures testaceous ; distance between the first 

 recurrent nervure and the base of second submarginal cell on the 

 cubital nervure not greater (usually less) than the length of the peti- 

 ole of the second submarginal cell. Length 5-6 mm. 



$ . — Anterior margin of clypeus very strongly rounded-out, or 

 slightly produced medially ; antenna? more distinctly clavate than in 

 the 9 , the first two joints of flagellum about equal in length; ventral ab- 

 dominal segments 3-6 with a transverse row of tubercles or swellings; 

 clypeus entirely, scape beneath, tegulse, tubercles, apex of femora, 

 the tibia?, except inner side of two anterior pair, and the tarsi, bright 

 yellow. Length 4£— 5 mm. 



Agricultural College, Michigan, in June and July (G. C. Davis); 

 Montana (Morrison). 



2. — Plenoculus propinquus n. sp. 



$ . — Anterior margin of clypeus very strongly incised, armed on 

 each extreme side with two very prominent teeth, the part between 

 these teeth and the medial incision seemingly entire; first joint of 

 flagellum about equal to the second in length, at any rate not 

 longer ; dorsulum and scutellum finely punctured, more distinctly so 

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