20 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



elongated, face deeply depressed and narrow, its facial ridges high. 

 It differs in having the facial ridges bristly almost up to the arista, 

 which is short and thickened to tip; male without proclinate orbi- 

 tals; the hairs of parafacials and parafrontals much coarser and 

 more erect; the size considerably less, and the body more slender. 

 Otherwise it is structurally very much like Gonia. 



KEVS TO SPECIES OF CHAETOCRANIOPSIS 

 MALES 



Arista with blunt tip, pulvilli of front tarsi longer than last tai-sal joint ; about 

 13 pairs of frontals chilensis Townsend. 



Arista with acute tip, although thickened for most of its length ; front tarsi 

 with small pulvilli ; about 8 pairs of frontals argenticeps, new species. 



FEMALES 



Pollen of parafrontals and parafacials plumbeous chilensis Townsend. 



Pollen of parafrontals and parafacials silvery argenticeps, new species. 



CHAETOCRANIOPSIS CHILENSIS Townsend 



Chaetocraniopsis chilensis Townsend, Ins. Ins. Menst., vol. 3, 1915, p. 69. 



Besides the male type, the museum has received two females col- 

 lected by Senor A. Faz at Perales, Chile. They have two pairs of 

 orbitals, the arista is acute at tip, the third antennal joint is one and 

 one-half times the second, the parafrontals and parafacials are 

 somewhat less bristly than in the male. They differ from the females 

 of argenticeps in having the front of head more bristly, as well as in 

 the color of its pollen. 



CHAETOCRANIOPSIS ARGENTICEPS, new species 



Male. — Front 0.48 of head width at vertex, inner edge of eyes 

 straight and slightly diverging, separated by 0.61 of head width just 

 above vibrissae; parafrontals and parafacials silvery, with less nu- 

 merous bristles than in chilensis; antennae black, basal joints red, 

 second hardly more than one-fourth as long as third, arista about 

 two-thirds as long as third antennal joint, its apical segment four 

 times the preceding; palpi yellow; cheek one-fourth eye height, dis- 

 tinctly narrower than parafacial, with black hairs; beard of back 

 of head white. Thorax black, with indistinct stripes of pale pollen ; 

 dor.socentral 3, 4; sternopleural 4; scutellum with 3 marginal, a 

 spiny suberect apical pair, and a small discal ])air; calypters white. 

 Abdomen shining black, basal half to three-forths of second and 

 third segments above white pollinose, which does not continue be- 

 low. First and second segments with a pair of median marginals; 

 third with a stout marginal row of 10; fourth with a smaller mar- 



