THAUMASTOPTERA. 133 



Thorax brownish-ochraceous, with three brown stripes ; the inter- 

 mediate one begins at the collare ; the lateral ones are abbreviated 

 before and extended beyond the suture behind ; scutellum yellow, 

 metathorax more or less brown in the middle, yellow on the sides ; 

 pleurae yellow, with a more or less distinct brown stripe, running 

 from the collare to the base of the halteres ; the latter pale. 

 Feet pale yellowish ; tips of the femora and of the tibiae brown ; 

 last joints of the tarsi brown. Abdomen brown, posterior margins 

 of the segments a little paler; male forceps tawny. Wings (Tab. 

 I, fig. 12) hyaline, veins brown, costal and subcostal tawny; 

 anterior margin distinctly hairy ; stigma brown, rounded, near the 

 tip of the first longitudinal vein. (For the further description 

 of the venation compare the generic characters.) 



Eab. Washington, D. C. ; Trenton Falls, X. Y., in June ; 

 Illinois (Mr. Kennicott). A specimen from Georgia, in the 

 Berlin Museum, seems to belong here. 



One of my specimens, a male, shows a slight difference in the 

 venation ; the latter portion of the second longitudinal vein is 

 more straight, and the cross-vein, closing the discal cell, is a 

 little nearer to the apex of the wing, which changes the shape 

 of the discal cell. The original description of this species was 

 drawn from four specimens ; I have only two left at present. 



Gen. XV. THAUMASTOPTERA. 1 



Not having seen this European genus, I translate the following 

 description by Mr. Mik, from the Verh. Zool. Bot. Gesellsch. in 

 Wien, 1866, p. 302. The appended woodcut is copied from a 

 figure in the same volume : — 



Head rounded, transverse, somewhat flattened ; occiput rather 

 strongly developed ; rostrum moderately prolonged ; palpi four- 

 jointed, the two last joints of equal length, more slender than 

 the two first ; front broad in both sexes ; antennae rather short, 

 16-jointed; first joint cylindrical, 01 the length of the rostrum, 

 the second cyathiform, transverse, the following joints oblong, 

 sessile, somewhat verticillate, gradually diminishing in size ; the 

 last joints indistinct. Eyes round, glabrous. Thorax convex, 

 gibbose, projecting over the narrow collare ; transverse suture 

 distinct ; scutellum narrow ; metathorax well developed. Abdo- 



1 SavfAaarot;, wonderful ; trrtfot, wing. 



