13 



When preparing my List of Florida Diptera, I noticed that this 

 fly differed from the typical form, but having only one specimen, I 

 refrained from describing it. Through the kindness of Mr. Nathan 



Fig. 1. 

 Fig. 2. 



Dipalta serpentina O. S. 

 • Dipalta banksi Johns. 



Banks I am able to study some additional material from Virginia and 

 find that the characters referred to by Osten Sacken are constant and 

 readily separate it from the western species. 



Thinophilus bimaculatus, sp. nov. 



cf. — Front, face, and occiput covered with a silvery-white pollen; palpi 

 white, broad; antennae yellow, the third joint brownish on the outer margin. 

 Thorax and pleura with a whitish pollen; two narrow abbreviated subdorsal 

 lines and the scutellum brown. Abdomen with a whitish pollen. Legs yellow, 

 the basal half of the femora and the outer half of the tarsi blackish, the tarsi 

 slender and of even width. Halteres light yellow. Wings whitish-hyaline, 

 veins brown with a distinct clouding at the posterior cross-vein, and on the 

 fourth vein midway between the cross-vein and the tip; there is also a slight 

 clouding at the junction of the third and fourth veins. Length 2.5 mm. 



The female is similar except that the front and face are broader, the pollen of 

 the vertex and the dorsum of the thorax are more yellowish, and the clouding 

 on the wings is more diffused. Length 3 mm. 



Six specimens collected on the white sand near the South Beach, Anastasia 

 Island, St. Augustine-, Florida, April 19 and 21, 1919. Types, in the author's 

 collection. 



This species resembles T. neglectus Wheeler from Cape May, New 

 Jersey, but is readily separated by its narrow, not broadened tarsi, 

 the more conspicuous cloudings on the wings, and much lighter color. 



Thinophilus prasinus, sp. nov. 



d". — Front, face, and occiput a light, dull green covered with a grayish 

 pollen, the broad palpi white, the occiput bearing long white hairs; antennae 

 yellow, the upper part of the third joint brown, the thickened basal portion 

 of the aristae black, the remainder white. Thorax dull green, the dorsum 

 brownish- and the pleura whitish-pollinose; six dorso-centrals. Abdomen blue- 

 green dulled by a whitish-pruinose covering. Front coxae yellow, dark at the 

 base; the others dark, covered with a white pollen. Legs yellow, tips of the 



