INSECUTOR INSCITI^ MENSTRUUS 45 



A GENUS OF HYSTRICIINE FLIES WITH 

 WHITE MAGGOTS 



By CHARLES H. T. TOWNSEND 



Peru, which is noted for its unique conditions and forms 

 of life, affords us the following unique case of perfectly white 

 first-stage maggots in a member of the tribe Larvcevorini, 

 from the Andean altitudes. This fly is closely similar in ex- 

 ternal characters to Andinomyia and Vibrissomyia, whose 

 first-stage maggots are of the ordinary colored-platelet type, 

 hitherto considered distinctive of the Hystriciinae. It inhabits 

 the same high puna region, and occurs in company with those 

 genera, but appears to be comparatively rare. 

 Sorochemyia, new genus. 



Genotype, Sorochemyia oroya Townsend, new species. 



Differs from Andinomyia as follows: Third antennal joint 

 of female about equal to the elongate second, or very slightly 

 longer, moderately and evenly widened distally, truncate on 

 apex but not strongly so ; that of male more distinctly but yet 

 only slightly longer than second, more widened distally, the 

 upper edge not as long as under edge in profile, more rounded 

 on corners, obliquely subtruncate. Parafacials nearly as broad 

 as eye in female, rather less in male, the head rather higher in 

 proportion to length and thus not so conspicuously elongate. 

 Two rows of frontal bristles, all directed inward; three or 

 rarely four facio-orbitals, better separated from lowest 

 frontals; female with only two proclinate fronto-orbitals. 

 Proboscis not quite so long, the part beyond geniculation 

 scarcely equalling or at most not exceeding head-height. The 

 two strong lateral scutellar macrochaetae reach beyond middle 

 of third abdominal segment. Abdominal macrochaetae longer 

 and stronger, the anal segment with discal, submarginal, and 

 marginal rows. Bristly hairs of abdomen conspicuously longer 

 in both sexes, especially so in male, more of the nature of 

 pile. Male claws elongate, those of female much shorter. 

 Front tarsi of female distinctly widened, but only slightly so. 

 Sorochemyia oroya, new species. 



Length of body, 11 to 12 mm. ; of wing, 9 to 9.75 mm. One 



