HOUGH: SOUTH AMERICAN MUSCID.E. 207 



spinose at the base only. The species was believed by Lynch 

 to be identical with Chrysomyia maceUaria Fabr., and with this 

 opinion I concur. The species belongs to the genus Clirysomyia, 

 and the name Parahicilia should be dropped. The extent of 

 the spines at the base of the t^ird vein varies in different spe- 

 cies, and may be as much as half way to the small cross-vein. 



Chrysomyia purpuras. 



Musca purpunr Walk., Dipt. Saund., p. 337. 



I recognize, of course, that it is rather hazardous to identify 

 a species as one of Walker's, but if one can interpret his words, 

 "a luteous scapula on each side of the fore breast," as mean- 

 ing that the prostigma is yellow, then I may feel quite confi- 

 dent of the determination. 



One male and four females ; Chapada ; no dates. 



Length, 5 to 8 mm. Dorso-ventral diameter of bucca one- 

 fifth that of head. 



As in the preceding species, the eyes of the male are almost in 

 contact over the middle two-fourths of the front, and the trans- 

 frontals are limited to that part of the front ventrad the narrow 

 portion. 



The width of the front of the female is to the width of the 

 head as 1 :3.5. The bristles of the head in both sexes are as 

 in Hegmentaria, but rather more delicate, except that on the 

 geno-vertical plate laterad the transfrontals the tiny bristlets 

 do not end dorsad at the more ventral of the orbitals, but con- 

 tinue dorsad to the vertex. The whole vitta and the whole 

 geno-vertical plate are thickly yellowish-gray pollinose. 



The thorax is much more pollinose than in segmcntoria, even 

 the scutellum, meso-pleura and sterno-pleura appearing white 

 pollinose if viewed by very oblique light. The hairs of the 

 meso- and sterno-pleura^ are black ; in segmentaria they are 

 yellow. The bristles of the thorax are shown in figure 3. 

 Only the two most caudad of the dorso-centrals are at all promi- 

 nent. There is no lateral posthumeral. In every specimen 

 there is one large marginal scutellar and one fair-sized discal 

 scutellar. Squamuh^ pale yellowish brown to white. The legs 

 are as in segmentaria. The wing is shown in figure 4. The 

 spines of the third longitudinal extend about one-third the dis- 

 tance to small cross-vein. Bristles of legs as in segmentaria. 



