244 PKOCEEDINGS OF THE ACADEMY OF [1897. 



half that of the corresponding part of second ; basal and cubital 

 (of hind wings) interstitial. Length 10} mm. 



Chapada (December). One specimen. Belongs to Kohl's Group 1. 



Pompilus triquetrus n. sp. 



9 . — Black ; abdomen at base, and dorsals 1-3, or 4, more or less 

 red (either with red fascia? or entirely of that co\or) ; head and 

 thorax maculated with bright silvery pubescence as follows : front, 

 face, clypeus, cheeks, prothorax anteriorly and a medially inter- 

 rupted line on posterior margin, dorsulum posteriorly, postscutellum 

 (metanotum), large spot on rnesopleura?, small spot at each side of 

 middle segment anteriorly and larger one at postero-lateral angles, 

 and greater part of coxse ; clypeus incurved medially ; eyes not con- 

 verging, reaching mandibles, space between them at top about 

 equalling the length of first flagellum joint ; space between hind 

 ocelli about equal to that separating them from eyes ; front strongly 

 impressed before the anterior ocellus ; antenna? rather stout, about 

 equal to length of head and thorax, the first flagellum joint as long 

 as second and a little more than half of third united ; pronotum 

 angulate posteriorly ; middle segment rounded, scarcely or not im- 

 pressed ; legs strongly spinose, tarsal comb fairly well developed ; 

 claws with a sharp median tooth, spurs testaceous, the inner one of 

 hind tibia? about equal to half the length of first hind tarsal joint (in 

 two smaller specimens it is decidedly shorter) ; abdomen large, broad 

 at base as in amethystinus, with cinereous pile, beneath and apically 

 with long black hairs ; wings fuscous, Avith a dull purplish tinge, 

 second submarginal larger than the third, oblong and narrowed 

 about one-fourth above, third submarginal triangular ; as a rule the 

 second and third transverso-cubital veins coalescing above (sepa- 

 rated in one specimen, however) ; basal vein interstitial, the cubital 

 vein of hind wings either interstitial or originating a short distance 

 before apex of submedian cell. Length 14-15 mm. 



Corumba (April) ; Chapada (November). One specimen has the 

 spots of thorax golden. Belongs with the preceding species. 



Pompilus erraticus Dhlb. 



I doubtfully refer a specimen from Corumba (March) to this spe- 

 cies. It agress with the short description given by Dahlbom, but is 

 larger, measuring 11 mm. (5} lines). 



Pompilus partitus n. sp. PI. IV, f. 4. 



9 . — Head, thorax and legs black, opaque ; abdomen except last 

 two or three segments red ; clypeus broadly subtruncate ; eyes not 



