534 PROCEEDINGS OF THE ACADEMY OF [1893. 



close punctures ; first joiut of flagellum about one-third longer than 

 the second; distance between hind ocelli somewhat greater than the 

 space between them and the nearest eye-margin ; dorsulum finely 

 and closely punctured ; metathorax above with a central, longitudi- 

 nal raised Hue, from each side of which, extend in an irregular man- 

 ner coarse folds or rugae; posterior face coarsely rugose, the metaplurse 

 finely granulated; legs not very strongly spinose. Black, the tegu- 

 \ve and tarsi somewhat testaceous ; clypeus densely, and thorax more 

 or less, with silvery pubescence; legs and abdomen with a silvery 

 pile, which is most conspicuous on apical margin of segments 1-3 ; 

 wings subhyaline, apex fuscous, nervures testaceous. Length 11-13 

 mm. 



$. — Resembles the 9 but is smaller ; anterior margin of clypeus 

 in the middle strongly bilobate, not dentate laterally ; antenna? 

 shorter and stouter ; legs feebly spinose ; colored and ornated like 

 the 9 ; dorsulum with the punctures finer. Length 7-9 mm. 



Canada to Florida, westward to Montana. L. caliptera Say is 

 probably only a variety of this species. 



2. — Lyroda triloba Say. 

 L. triloba Say. 1. c. p. 372. 



9 . — Anterior margin of clypeus subtruncate medially, not den- 

 tate laterally ; front and vertex seemingly impunctate ; first joint of 

 flagellum a little more than one-third longer than the second ; dis- 

 tance between the hind ocelli, if anything, a little less than the space 

 between them and the nearest eye-margin ; dorsulum indistinctly 

 punctured ; metathorax above finely rugoso-granulated, with a lon- 

 gitudinal medial raised line, the metapleura? coarsely striated 

 throughout. Deep black ; tegulre and tarsi somewhat testaceous ; 

 head and thorax, especially the face and clypeus, with brownish 

 pile ; abdomen also sparsely pilose, but the pile is not silvery or con- 

 spicuous ; wings dark fuscous, iridescent. Length 14-15 mm. 



Canada to Texas ; Illinois; Indiana (Say). The large size and 

 dark wings will at once distinguish this species from subita. 



DIPLOPLECTRON Fox. 

 Diploplectron Fox, Tr. Ainer. Eut. Soc. XX, p. 38, 1893. 



Head broader than the thorax ; mandibles bidentate at apex, the 

 outer tooth by far the longest, the outer margin is incurved medially, 

 or very slightly emarginate, in the 9 the mandibles are shorter, broader 



