Sept., I9I3-] Melander: Synopsis of Diptera. 241 



DESMOMETOPA Loew. 



The interfrontal cross-bristles located on evident stripes which form a letter 

 M on the black front 2. 



The cross-bristles are not located on specialized stripes; front red anteriorly; 

 cheeks, palpi and halteres yellow ; front tibiae with two narrow pale 

 rings, tarsi annulate; hind femora of male strongly explanate. (Eur.; 

 Ont. ; Mass.,* Pa.,* N. J., 111.,* Tex.,* S. Dak., Ala., Wash.*) 



latipes Meigen. 



2. Halteres black; palpi and legs wholly black; entire insect black. (Eur.;* 



Id., Wash.,* B. C.*) sordidum Fallen. 



Halteres pale 3. 



3. Palpi wholly black; tarsi more or less reddish; cheeks black, narrow, the 



pollinose lower edge delimited from the polished upper part by a 

 waving line. (Africa ; Asia ; Cuba ; Ga.,* Mass.,* Tex.*) . tarsalis Loew. 

 Palpi yellow at the base and black at the end ; tarsi black ; cheeks one third 

 the eye-height, the pollinose lower portion with biangulate margin. 

 (Eur.; Afr. : Mass.,* N. J.) m-nigrnm Zetterstedt. 



MADIZA Fallen. 



Polished black, including the halteres, the abdomen very lightly dusted ; lunule, 

 palpi and posterior tarsi yellowish ; wings whitish hyaline, veins pale 

 yellow. 2 mm. (W. Ind. ; Mass.,* N. Y.,* N. J., 111.,* Fla., Tex.,* 

 Col.,* Wyom.,* N. Mex., Id., Wash.,* B. C.*) (Desmometopa.) 



halteralis Coquillett. 



PLATOPHRYMYIA Williston. 



I strongly suspect that this genus and Lcptometopa Becker are the 

 same. The narrowed first posterior cell, the pruinose abdomen, the 

 whitish wings, the narrowed front, and the long horizontal oral margin 

 are suggestive of the synonymy. The strikingly explanate hind tibiae 

 of Lcptometopa are characteristic of the males alone. It is possible 

 either that the West Indian species is not so formed, in which case 

 the two are different genera, or that the description of Platophrymyia 

 was drawn up from a female. Williston states that the legs are short 

 and rather strong, a description that characterizes the female of 

 Lcptometopa. I have specimens of Lcptometopa from Cape Colony, 

 South Africa. 



Black, including the antennae and palpi ; thorax lightly cinereous, abdomen 

 pruinose; halteres yellow; metatarsi yellowish; wings whitish-hyaline. 

 2 mm. (W. Ind.) nigra Williston. 



