508 MEMOIRS OF THE CARNEGIE MUSEUM 



coxae, the femora and the last joint of the tarsi, are yellowish-white, the coxse, the 

 femora except at apex and the abdomen, are dark blue, the last joint of the tarsi 

 being black or brown. The metanotum is smooth, with two longitudinal sulci. 

 The abdomen is ovate, not longer than the thorax, the second segment occupying 

 hardly half its whole surface, the following segments short, nearly equal. 

 Brazil : Rio de Janeiro, in August. 



HORISMENUS CORUMB^, Sp. UOV. 



Female. — Length 2 mm. iEneous black, the thorax smooth except the middle 

 mesothoracic lobe ; the legs, except the coxie, are honey yellow, with the knees, tips 

 of tibse and the tarsi yellowish white. The abdomen is conically pointed, a little 

 longer than the head and thorax united, the second segment being very long, occu- 

 pying two thirds the whole surface. 



Brazil : ( "orumba, in February. 



HORISMENUS PERSIMILIS, Sp. nov. 



Female. — Length about 0.9 mm. Mostly Ijlue, the scutellura with a decided 

 feneous tinge ; flagellum brown Ijlack, pubescent ; scape and legs, except as hereafter 

 noted, honey yellow, the knees, tips of tibiae and the tarsi whitish. The abdomen 

 is ovate, not longer than the thorax, the second segment occupying more than half 

 the whole surface. 



Brazil : Chapada, in April. 



HORISMENtrs .aiNEICOLLIS, sp. UOV. 



Female. — Length L6 mm. Mostly blue, the pronotum above and the metanotum 

 seneous or metallic greenish, the scape of the antennte and the legs, except the coxfe, 

 honey yellow. The abdomen is ovate, a little longer than the thorax, the second 

 segment occupying hardly half the whole surface. 



Brazil : Santarem. 



PELOROTELUS Ashmead, gen. nov. 



Allied to Pleurotrojyis Forster, but easily separated by the absence of the lateral 

 metathoracic carina3, by the metathorax being produced into a long neck at apex 

 and ])y the abdomen, which is very lengthy-petiolated, the petiole being about as 

 long as the hind femora. 



The head is very wide, sublenticular, seen from in front wider than long, the 

 occiput concave ; the antennae are ten-jointed, with one ring-joint, the scape clavate, 

 the pedicel obconical, not much longer than wide at apex, the funicle joints oljlong, 

 about thrice as long as thick, briefly pedunculate at apex, clothed with rather long 



