NEW MUSCOID FLIES FROM THE ANDEAN MONTANYA 29 



nent rounded tubercle midway between mouth and eintennae. Abdomen 

 dark fenuginous shading to black. 



Length : Body, exclusive of ovipositor, 35-37 mm. ; wing 28-3 1 mm. 



Type, Cat. No. 18236, U. S. Nat. Mus. 



Island of Trinidad, four males and one female, bred from larvae boring 

 in trunk of tree (F. W. Urich) ; St. Jean, French Guiana, one male (W. 

 Schaus) ; Ancon, Canal Zone, Panama, one femeJe, June, 1911 (A. H. 

 Jennings). 



Apparently closely related to P. argyropasta, described by Bigot from 

 Panama, but distinct. The description of that author is insufficient for 

 exact diagnosis. The white deposit which occurs on the abdomen of the 

 Pantophthalmidae is apparently a secretion similar to that occurring in 

 certain Coleoptera and Homoptera and is present or absent, according to 

 the age and physiological condition of the individual, and therefore can- 

 not be employed as a specific diagnostic. Likewise the abdomen may 

 be either dull or shining, as is shown by the specimens bred by Profes- 

 sor Urich cind which are undoubtedly conspecific. 



NEW MUSCOID FLIES, MAINLY HYSTRICIID>E AND 

 PYRRHOSIINi^ FROM THE ANDEAN MONTANYA 



By CHARLES H. T. TOWNSEND 

 Director of Entomological Stations, Lima, Peru 



(Continued from Vol. 11, page 16) 



Gymnochaetopsis analis, new species. 



Length of body, 9 to 1 mm. ; of wing, 7.5 to 8 mm. Six females 

 and one male, Mallares and Canada de Saman, valley of the Rio Chira 

 in northwestern Peru, on flowers of Spilanthes sp. and Philihertella 

 flava, February 1 3 and 14, 1912. 



Head silvery-white, parafrontals and occiput faintly brassy, occiput with 

 yellowish-gray pile, frontalia pale brownish. Antennae brownish-yellow ; 

 basal half of second joint, front border of third joint, and arista brownish. 

 Palpi brown to yellowish-brown. Pleurae and thorax silvery with feiint 

 brassy tinge above ; five rather heavy vittae, the median one abbreviated 

 in front, the next abbreviated behind, the outer heaviest and interrupted 

 in some lights. Scutellum pcJe straw-yellowish, dusky at base. First 

 abdominal segment blackish above ; anal segment usually wholly yellowish- 

 reddish in female, dusky at base in male ; intermediate segments dusky 



