2 PEOCEEDIlSrGS OF THE NATION" AL MUSEUM vol.73 



the presence of these rather than on the form of the face and the 

 setulose sciitellum. In this case the genus would contain the geno- 

 type and four species known to me — frontalis Macquart, assimilis 

 Malloch, geniseta Malloch, and the species described below. Only 

 the genotj^pe and the last of these have the scutellum haired on the 

 disk, and these two and frontalis have the frons with a pair of 

 velvety black marks in front. However fulchrifrons may not have 

 mid tibial setulae. 



I present below a key for the separation of the above-mentioned 

 species and the new one described herein. 



KEY TO THE SPECIES OF DEUTOMINETTIA 



1. Frons with two black marks in front ; scutellum in some species with distinct 



setulose hairsi on disk in addition to the four marginal bristles 2 



Frons yellow, unspotted ; scutellum with the disk bare, only the four mar- 

 ginal bristles present 4 



2. Wings without dark mai'kings bimaculata, new species. 



Wings with distinct dark markins 3 



3. Only the third wing vein dark at apex ; disk of scutellum setulose. 



pulchrifrons Hendel. 

 Costal margin dark brown, more broadly so from oppo^te inner cross vein to 

 beyond apex of fourth vein, the dark color on apices of third and fourth 

 veins narrowly divided by a longitudinal hyaline streak inwardly, both 

 cross veins broadly dark brown, fifth vein faintly clouded ; disk of scutel- 

 lum bare frontalis Macquart. 



4. Cross veins of wings very distinctly clouded 5 



Cross veins of wings almost imperceptibly clouded geniseta Malloch. 



5. Costa without an apical suffusion; mid tibia with about three rather long 



posterior bristles ; hind femur with at least one evident preapical antero- 



ventral bristle assimilis Malloch. 



iCosta with a trace of an apical suffusion ; mid tibia with about seven short 

 posterior setulae; hind femur without an evident preapical anteroventral 

 J:)ristle„„ approximata, new species. 



Should the presence of scutellar setulae be considered as the dis- 

 tinctive generic character, the four species lacking these would then 

 require to be placed in a separate genus, but the absence or presence 

 of similar hairs has not been considered as sufficient grounds for 

 the erection of genera in related families such as Helomyzidae. 



A careful examination of Hendel's description of his genus 

 AUoniinettia and its genotype, maculatifrons Hendel, leads me to 

 conclude that this is the same species which I have identified as 

 frontalis Macquart.^ Hendel's specimens came from Peru, while 

 those I had came from Costa Rica. He makes no mention of the 

 mid tibial bristles, but there is nothing remarkable in that, as this 

 character has been ignored by all writers who have dealt with the 

 family until the appearance of my recent papers on the Oriental 

 species of Eomoneura sens. lat. As indicated in my previous paper, 



« Hist. Nat. Dipt., vol. 2, pt. 3, p. 346, from Brazil. 



