AMERICAN HYMENOPTERA. 135 



piceous, anterior femora beneath produced into a large obtuse spine, the base 

 of their tarsi deformed; intermediate tibiae and tarsi dilated, clothed with 

 black pubescence, that ou tips of tibiae pale sericeous; posterior coxse and 

 trochanters each with a spine beneath, their femora silvery sericeous within, 

 their tibiae constricted at base and dilated towards tip, with a tuft of white 

 pubescence at tip as in 9, basal joint of their tarsi distorted, fringed on outer 

 edge with black pubescence, inner edge compressed, ferruginous, with a short 

 hooked tooth near base, the tip produced and twisted; abdomen piceous, the 

 apex with black pubescence, third ventral segment clothed and fringed with 

 whitish pubescence. Length .35 inch. 



Hah. — Mexico, (Sumichrast). Sixteen specimens. 



Tetrapedia lugubris.— 'J, .— Black, shining, the pubescence black; 

 apical margin of clypeus, labrum except disk and the mandibles more or less, 

 dull yellow ; sides of face, labrum and cheeks with a silvery sericeous pubes- 

 cence; antennae piceous, the flagellum dull testaceous beneath; mesothorax 

 nude, subopaque, disk with a well impressed longitudinal line, and a short 

 one over tegulse; prothorax piceous, prominently transversely constricted; 

 scutellum with short black pubescence; the pubescence on sides of meta- 

 thorax and pleura silvery-white in certain lights; tegulse piceous; wings dark 

 fuliginous, the apex pale yellowish-fuscous, nervures yellow; legs rufo-pieeous, 

 clothed with black pubescence, simple, basal joint of tarsi flat, dilated, fringed 

 behind with long black pubescence, tips of posterior tibiae with a patch of 

 white pubescence; abdomen smooth and polished, the sides and apex fringed 

 with long black pubescence, that at apex mixed with whitish; ventral seg- 

 ments fringed with black pubescence; a dot on each extreme sides of fourth 

 and fifth dorsal segments, and the third or fourth ventral segments pale 

 testaceous. Length .40 inch. 



Hah. — Mexico, (Sumichrast). Two specimens. This has much 

 the general appearance of maiira, but the legs are simple and not 

 deformed as in the % of that species. 



Tetrapedia nieesta.— 9 .— Black, shining, the pubescence black; face 

 and cheeks silvery-sericeous, labrum fringed with golden pubescence, clypeus 

 with shallow sparse punctures, the face above antennae flat, smooth and polished, 

 impunctured; antennae piceous, flagellum dull testaceous beneath; mesothorax 

 opaque, a well impressed longitudinal line on anterior middle and a very short 

 one on each side over tegulse; sides of scutellum with a patch of short black 

 pubescence; tegulae piceous; wings fuliginous, apex beyond third submarginal 

 cell subhyaline, second submarginal cell receiving the recurrent nervure be- 

 tween middle and apex, the third submarginal narrowed nearly one-half to- 

 wards marginal; legs rufo-piceous, the pubescence entirely black, basal joint 

 of anterior tarsi short and broad, spurs of intermediate tibiae long and simple, 

 hooked at tip, those of posterior tibiae long, slender and white ; abdomen piceous 

 or black, smooth and polished, apex clothed with black pubescence, ventral 

 segments 2—4 fringed with long white hair. Length .30 inch. 



% ■ — Triangular mark on sides of face, clypeus, spot above, labrum, mandibles 

 except tips and scape beneath, yellowish-white; tips of tarsi fulvo-testaceous, 

 spurs of posterior tibise more or less pale, sometimes brown, basal joint of four 

 posterior tarsi short, broad and fringed behind with long black hair. Length 

 .35 iuch. 



