AMERICAN HYMENOPTERA. 243 



terior tibiae except on the posterior face, base of posterior tibise yellow, tarsi except 

 the brownish apical joints whitish, apex of mandibles brown. 



Type locality, Riverton, New Jersey. Type, Acad. Nat. Sci. 

 Phila. June 6 (C. W. Johnson). 



Diodoutus crassicornus n. sp. 



Related to rugosus. The antennae are thicker than in any other 

 North American species of this genus. 



% . 4 mm. long. General form compact. Head. — Very finely sculptured and 

 with numerous indistinct punctures rather close together, sculpture of the lower 

 half of the face hidden by appressed silvery pubescence ; cheeks broad and gently 

 rounded ; ocelli forming a low triangle, the distance between the posterior ocelli 

 a little greater than the distance between the lateral ocellus and the nearest eye 

 margin; antennae dull sericeus, joints of the flagellum subequal, terminal joint 

 longest, nearly as long as the first two joints together, all except the terminal 

 joint nearly as thick as long, flagellum somewhat serrated on the under side; 

 labrum deeply broadly emarginate. 



Thorax. — Pronotum roughened, rather angular; dorsulum rather densely 

 punctured, with punctures like on the front; scutellum sculptured like the dor- 

 sulum ; pleura rugulose, the metapleura rather striated ; metathorax irregularly 

 reticulate, with an indistinct pit in the middle of the superior half of the posterior 

 face, no distinctly toothed lateral margin ; legs smooth, the posterior tibi£e with 

 strong bristles on the posterior margin ; wings clear, slightly smoky, nervures 

 and stigma dark brown, the latter nearly black, transverse median nervure nearly 

 interstitial with the basal nervure, first recurrent nervure joining the first sub- 

 marginal cell about one-third its length on the cubitus from the first transverse 

 cubitus, second recurrent nervure joining the second submarginal cell in the 

 middle; the second submarginal cell about three times as broad on the cubitus 

 as on the radius. 



Abdomen very minutely punctured and dullish, the sutures rather constricted. 



Black ; mandibles except at apex yellow ; legs largely brownish ochreous, mid- 

 dle and posterior femora black except at tips; about one-half of the anterior 

 femora colored like the tibise. 



Thinly indistinctly sericeous, the apical abdominal segments rather distinctly 

 sericeous. 



Type locality, Corvallis, Oregon. Type, Acad. Nat. Sci. Phila. 



July 7, 1896 (A. B. Conlley). 



Passalaccus rivertonensis n. sp. 



Allied to aunalatus, but differs in having the parapsidal furrows 

 faint, not foveolate ; length of the cubitus between the first recur 

 rent nervure and the first transverse cubitus less than half the 

 length of the first transverse cubitus. 



% . 5 mm. long^ Head. — Front finely granular ; vertex with fine separated 

 punctures on a shining surface; frontal impression not distinct; ocelli situated 



TKAN8. AM. ENT. 80C. XXX. AUGUST. 1904. 



