208 KANSAS UNIVERSITY QUARTERLY. 



Chrysomyia desvoidyi nov. sp. 



Four males and two females ; Chapada ; no date. 



Length, 8 to 9 mm. Metallic purple, with three faint stripes 

 on thorax ; bucca', autenmr and palpi yellow ; legs brown ; 

 wings hyaline, with blackish base ; first segment of abdomen 

 and caudal borders of second and third blackish ; sterno-pleural 

 bristles, 2:1; humerals, four ; dorso-ventral diameter of bucca 

 one-fourth that of head. 



The eyes of the male are almost in contact for about the 

 middle two-fourths of the front, 0.5 mm. At this narrow 

 part there is a linear vitta and the geno-vertical plates are re- 

 duced almost to nothing. Ventrad this portion the geno-ver- 

 tical plates are much narrower than in the female, yellowish 

 pollinose, and bear about ten transfrontal bristles. Dorsad 

 the narrow part there are no transfrontals, and the whole front 

 is black. The great ocellar bristles are parallel, proclinate, and 

 small. The lesser ocellars, including the postvertical pair, are 

 mere tiny hairs. The inner vertical is of fair size, the outer 

 vertical absent, the occipito-central present. Cilia of posterior 

 orbit in one complete row, black, not large. Occiput covered 

 with yellow hair, as far as I can see it. The posterior orbit is 

 yellow pollinose ; it narrows dorsad and vanishes about 0.5 mm. 

 from the vertex. 



The front of the female is one-fourth as wide as the head. 

 The vitta is black, more or less reddish toward the antennae. 

 The geno-vertical plate is about half as broad as the vitta, its 

 ventral half or two-thirds yellow pollinose, the pollen becoming 

 thinner as we pass dorsad until it wholly disappears, the dorsal 

 third being polished black. This dorsal third is thickly beset 

 with very minute black hairs ; passing ventrad these hairs be- 

 come more scattered, and on the ventral third are distinctly in 

 two rows and of a yellow color. 



The transfrontals are abqut ten, not large, and end a little 

 ventrad the anterior ocellus. There is one ascending frontal a 

 trifle caudad the posterior ocelli. Laterad the transfrontals 

 there are two small, equal, proclinate orbitals. The greater 

 ocellars are normal ; there are about six pairs of lesser ocellars, 

 and the exceedingly small postvertical is evidently a member 

 of the lesser ocellar group. The inner and outer verticals are 

 normal, the occipito-central a mere hair, the occipito-lateral not 



