768 MR. E. A. ELLIOTT ON THE 



joint twice as long as first, third longer than first and second 

 together. Neck elongate and very slender, posteriorly rugose, 

 especially laterally ; semiannular polished smooth, with a few 

 fine punctures and oblique striations. Mesonotum laterally 

 deeply pvinctato-rugose, with a central line of small but distinct 

 punctures, on each side of which is a smooth space bounded by a 

 row of broad punctui'es. Scutellum smooth, with a few con- 

 spicuous marginal punctvires. Mesopleura; rather smooth and 

 shining above, dull beneath, with diffuse and shallow punctures ; 

 metapleurae anteriorly finely and irregularly, posteriorly coarsely 

 reticulate rugose, not separated by any sulcus from the median 

 segment, which is punctate, except narrowly in the middle and 

 broadly at the sides. Petiole transrugose, as long as remainder 

 of abdomen ; second segment smooth, basally rugose ; third and 

 fourth finely wavily transrugose, third centrally feebly longitu- 

 dinally aciculate (in small individuals nearly smooth). Terebi^a 

 as long as body, white-banded before apex. Hind legs with 

 coxse extremely finely transrugose between coai'se, scale-like 

 rugosities ; femora polished smooth, bidentate : tibiae compressed 

 to beyond middle. 



Black ; head, scape, first flagellar joint, and mandibles basally 

 ferruginous. Wings hyaline. 



Length 9'3-14-5 mm. The type in the Hungarian National 

 Museum at Budapest is 13 mm. long. 



Habitat : type from Obidos on the Amazon, Brazil ; Rio 

 Autaz. 



(S . Similar to 5 , but segment 4 subtransverse. Length 

 9-1 0"5 mm. 



Habitat : Rio Autaz, Amazon District, Brazil ; taken by 

 Roman in 1914-15. 



The elongate neck and shorter terebra will sufilce to distinguish 

 this species from H . collarifer , limpidipennis^ and tvilstneii Schlett., 

 in all of which the neck is normal and the terebra longer than the 

 body. 



8. wiJSTNEii Schlett. 



Stephanus vmstneii Schlett., p. 149, $ . 



5 . Frons irregularly rugose ; vertex transrugose ; occiput 

 rugose-puncta,te. Cheeks shorter than scape. Posterior margin 

 of head produced into a very distinct collar. Basal flagellar 

 joints normal. Neck with a few deep rugosities; semiannular 

 polished smooth, with diffuse punctures. Mesonotum with a 

 central row of punctures, on each side of which is a smooth 

 space, laterally rather densely rugose-punctate. Scutellum 

 smooth, with a few fine marginal punctures. Mesopleurse almost 

 smooth and slightly shining above, dull and rather coarsely and 

 densely rugose-punctate beneath ; metapleurte reticulate rugose, 

 more coarsely behind than in front, not separated from the 

 median segment by any sulcus. Median segment densely 



