120 S. A. ROHWER. 



Habitat. — Pullman, Washington, August 2, 1908 (W. M. 

 Mann). 



This species belongs near N. americana Rob. and N. emar- 

 ginata (Say), but differs from these species in the shape of 

 the squamae, the absence of yellow on the scutellum and 

 pronotum (this, however, is not always constant in americana 

 and emarginata) , and the much weaker carina on the prono- 

 tum; and clypeal carina is much better developed in N. 

 americana and N. emarginata. The basal nervure and tran. 

 med. in none of my specimens of emarginata are interstitial, 

 but the tran. med. is beyond. Taken the same time as N. 

 emarginata (Say). 



DIPLOPLECTRON Fox. 

 Diplopleetron rufoantennatus n. sp. 



Male. — Length 4.5 mm. Anterior margin of the clypeus rounded 

 out, in the middle produced into bidentate process; near the eye there 

 is a distinct tooth. Head finely closely punctured, with a few large 

 irregular punctures intermixed; furrow from the anterior ocellus rather 

 faint; ocelli in an equilateral triangle; distance between the eyes at 

 the top about the same as the length of antennal joints 3-4. Antennas 

 with the joints very distinct; joint three only slightly longer than 

 four; the basal joints with a few long hairs. Prothorax closely, finely 

 punctured; dorsulum, scutellum and mesopleuras not so densely punc- 

 tured as the prothorax and more shining. Metanotum finely granular; 

 metapleurae finely striated. Legs not so strongly covered with bristles 

 as usual. Abdomen impunctate, shining. Black; clypeus, mandibles 

 except the apex, a quadrate spot on the inner orbits and the tubercles 

 cream-color ; antenna?, tibia? and tarsi rufous. Wings slightly yellowish- 

 hyaline; costal apex of the posterior wings with a smoky spot; venation 

 brown. 



Habitat. — Florissant, Colorado, June 14, 1908 (S. A. Roh- 

 wer). Caught while flying over dry sand. 



Easily known by the rufous antennas from other black 

 males which have been described. It may be the male of 

 fossor, but the furrow from the anterior ocellus is distnict, the 

 front is more densely punctured and the antennae are rufous. 



Diploplectron fossor n. sp. 



Female. — Length 4.25 mm. Anterior margin of the clypeus rounded 

 out, produced in the middle into a bidentate process. Head impunc- 

 tate or if punctured only very finely so, there are, however, a few 



