386 PROCEEDINGS OF THE ACADEMY OF [1897. 



nodose, as long as the two following united ; wings subhyaline, apical 

 margins fuscous, nervures dark. Length 13 mm. 

 Corumba (April) ; Santarem. Two specimens. 



Trypoxylon fallax n. sp. 



9 . — Black ; sides of the first and second segments and base of the 

 latter reddish ; face, clypeus and suture below tegula? with silvery 

 pubescence, that on pronotum pale golden ; other pubescence pale ; 

 front coarsely granulated, with a prominence or tubercle behind 

 antenna?, and above it a V-shaped depression ; ocelli situated in de- 

 pressions ; space between eyes at top about equal to length of first 

 joint of flagellum, beneath at clypeus somewhat less; clypeus flat, 

 somewhat roundly produced, emarginate in middle of fore margin ; 

 thorax with distinct separated punctures ; above the middle segment 

 is finely punctato-striate, depressed slightly at apex, the posterior 

 surface more distinctly striated and sulcate down the middle; first 

 abdominal segment slightly nodose at apex, about one-quarter longer 

 than the second ; wings subhyaline, nervures dark testaceous. Length 

 1 3 mm. 



Var. (?). More subtilely punctured ; clypeus entire. 

 $ . — Similar to 9 , with the reddish color on abdomen more ex- 

 tended, the base of segments, 2-3 being of that color, and first joint 

 of tarsi pale at base ; clypeus roundly emarginate ; first joint of 

 flagellum slightly curved, the last joint but little longer than the 

 penultimate ; hind trochanters not dentate. Length 12 mm. 



Chapada (March) ; Maruru ; Santarem. Three 9 , one 2 , speci- 

 mens. Closely resembles medianum, but the clypeus is emarginate, 

 not dentate, front more coarsely granulated and with a V-shaped 

 depression, etc. 



In addition to the foregoing species of Trypoxylon the collection 

 contains eight other species, apparently new, represented by single 

 specimens, which, for that reason and to the inadequate descriptions 

 of many neotropical species, I have refrained from describing at the 

 present time. 



Oxybelus marginatum 8m. 



A single specimen from Santarem. 



Oxybelus americanus Spin. 



Five specimens. Chapada (May, December) ; Maruru (April) ; 

 Santarem. 



