522 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



mediate trochanters, femora and tibiae beneath and spot on the pos- 

 terior trochanters yellowish; intermediate tarsi and basal fourth of 

 posterior tibiae paUid; wings liyaHne, very shghtly dusky, strongly 

 iridescent; venation dark brown. 



Quirigua, Guatemala. Described from one male collected by 

 W. P. Cockerell, February, 1912. 



Type.~Cat. No. 15084, U.S.N.M. 



TRYPOXYLON AZTECUM Saussure. 



One female from Quirigua, Guatemala. 



TRYPOXYLON MEXICANUM Saussure. 



One female from Quirigua, Guatemala, February, 1912. 

 Prof. T. D. A. Cockerell has described this specimen as follows: 

 " Length about 20 mm. ; anterior wmg about 12 ; shming black, the 

 front dull and rugose; clypeus longitudmally cariiiate, its lower 

 lateral corners angled; sides of face, and inferior orbits behind, with 

 shining silvery hair; mandibles ferruginous; antennae entkely black; 

 emargmation of eyes very deep ; mesothorax with very fine pmictures, 

 scutellum almost impunctate on disk; hau* of front, vertex, occiput 

 and thorax short, scanty, and black; meta thorax smooth and shining, 

 with very feeble mmute punctures, and a slight median groove, but 

 the posterior part fijiely obliquely striate; tegulae shinmg black; 

 wings dark fuligmous, with a purple iridescence; basal nervwe falling 

 short of transverse medial; stigma very small; marginal cell long, 

 pointed at apex, angled beneath near middle; only two submarginal 

 cells, the first extremely long, receiving first recurrent nervure some 

 distance from end; second about half as large as first, about half as 

 wide above as below, receiving second recurrent nervnre about one- 

 fourth of its length from base; outer angle formed by second recur- 

 rent on joining second submargmal cell an acute angle; outer nervures 

 of third discoidal and second submarginal cell evanescent; legs black, 

 with the apical half of hind basitarsi, and the tlu-ee following joints 

 silver- white, with a creamy tint in some lights; last joint of hmd tarsi 

 with the base pale reddish, the apical part dark; hind spm- bent; 

 abdomen petiolate, elongate, smooth and slimmg, about 3 mm. wide 

 in middle; a depression between first and second segments dorsally; 

 no pygidial area; apical segment carinate; last ventral segment with 

 fine light brownish tomentum and long erect hairs." 



TRACHYPUS MEXICANUS (Cameron). 



Specimen from Quirigua, Guatemala, collected February 15, 1912, 

 on Pontederia cordata. 



CERCERIS IRESmmES, new species. 



This species does not agree with any of the species described by 

 Cameron, and as it is a male its affinities can not be easily ascertained. 



Male. — Length, 6 mm. Clypeus flat, the anterior margin tri- 

 crenulate, the lateral margin with strong tuft of hair; supraclypeal 



