ART. 1 NEW DIPTERA FROM SOUTH AMERICA ALDRICH 19 



hairlike above; parafrontals covered with long erect black hairs, 

 which continue on the parafacial. The pollen of the head is dark 

 olive. Parafacial nearly as wide as eye, cheek three-fifths the eye 

 height. Proboscis a little elongated, but not so much as the oral 

 cavity, so it readily folds out of sight entirely. Cilia behind eye 

 remarkably long, back of head with thin ruff of yellow hair. 



Thorax blackish, not distinctly striped, the black pile of dorsum 

 long and erect ; pleura also with the same pile, especially abundant on 

 mesopleura. Scutellum with dense row of straight, stiff spines on 

 margin and a few upright discal. Calypters dark brown. 



Abdomen black without lighter markings, at first seeming to be 

 entirely covered above and below with stout spines; but on careful 

 examination the anterior dorsal half or two-fifths of the third and 

 fourth segments and the whole of the very short first segment, except 

 the sides, are seen to be almost wholly bare. There are very abundant 

 spines in the middle of the venter and at the lateral edges, between 

 these regions some shining black bare surface is visible. Femora 

 black, tibiae and tarsi to tip red; claws red basally, pulvilli brown. 

 Femora and tibiae very spiny. 



Wings entirely infuscated; fourth vein with slightly acute bend 

 a little rounded off, ending far before apex; third vein with only a 

 few hairs at base. 



Female. — Front 0.34 of head width, two proclinate orbitals. 



Length, of both male and female, 12 mm. 



Described from 1 male and 4 females collected by F. X. Williams, 

 on Mount Tunguragua, Ecuador, January 18, 1923; received from 

 Hawaiian Sugar Planters' Association, to which two paratypes are 

 returned. 



Type.—U^lQ, Cat. No. 40982, U.S.N.M. 



Genus CHAETOCRANIOPSIS Townsend 



Chaetooraniopsi» Townsend, Ins. Ins. Menst., vol, 3, 1915, p. 68. 



The type and sole original species is O. chilensis Townsend, de- 

 scribed on page 69 of the above reference. It was described from 

 a single male specimen, collected by E. C. Reed in Chile, and now 

 in the United States National Museum. The genus was briefly de- 

 scribed in comparison with Chaetocrmim^ but the generic characters 

 of the latter were never published, as it was established by the mere 

 citation of a species as tj^pe.* The following notes are taken from 

 the type specimen of chilensis. It resembles the genotype of Gonia 

 (capitata De Geer) in having reclinate ocellars, the parafrontals 

 and parafacials wide and with coarse hairs, second joint of arista 



* Townsend, Proc. Biol. Soc. Wash., vol. 28, 1915, p. 23 ; type, Spallamania antennalis 

 Coquillet. 



