NATURAL SCIENCES OF PHILADELPHIA. 223 



not reaching beyond the middle of the wing ; the mediastinal cross-vein at a 

 moderate distance from the tip of the mediastinal vein ; the subcostal vein 

 not much extended beyond the central cross-veins ; one radial area and no 

 petiolated areolet : the microscopic pubescence of the wing is distinctly seen 

 under a moderate magnifying power ; it is rather sparse, the wing appearing 

 for this reason pure hyaline and transparent. Antennae 1G -jointed, nearly 

 reaching the base of the wing ; first joint cylindrical, elongated, second short ; 

 flagellum, submoniliform, with oblong joints and long verticils. Proboscis 

 cylindrical, slender, elongated, although shorter than the head ; palpi at the 

 tip of proboscis short, last joint very short ; eyes naked, moderately remote 

 above, approximated below. Collare prolonged in a narrow, almost linear 

 neck, which is half as long as the head. Feet of moderate length, rather 

 stout, hairy ; no spurs at the tip of the tibia? ; pulvilli small. The forceps 

 of the male consists of two oblong lobes, somewhat like those of Dicrano- 

 myia : large horny appendages on their under side; anal style distinct, (fig. 

 10 represents the forceps of T. complexa from above ; fig. 10 a, one-half of 

 it from below.) Valves of the 5 ovipositor of moderate length, slender, 

 arcuated. 



Is easily distinguishable by its broad, clear wings, the shortness of the 

 mediastinal and subcostal veins ; the short, hairy feet, the stout, short tho- 

 rax, rising abruptly above the abdomen, etc. The 16-jointed antenna?, the 

 structure of the ungues, and the presence of the pulvilli are as many points 

 of analogy with Limnophila nob., the neuration of the wings (which have 

 bdt one radial area,) and the absence of spurs at the tip of the tibia? remind 

 on the contrary of Limnobia nob. Hence the location of Teucholabis 

 in the present intermediate group. Rhamphidia scapularis Macq. Dipt. 

 Exot. i. l,.pl. 10, f. 1, shows some analogy with T. complexa, especially 

 in the neuration of the wings. 



T. complexa. Brunneo-flava, thorace vittis tribus brunneis ; alis hya- 

 linis ; stigmate subrotundo, fusco ; long. lin. 2^-2^. 



Head blackish cinereous, antenna? and palpi black. Thorax yellow with 

 three brown stripes ; the intermediate one begins at the collare ; the lateral 

 ones are abbreviated. before and extended over the scutum behind ; scutellum 

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

 pleura? yellow with more or less distinct brown stripes, running from the 

 collare to the abdomen ; halteres pale ; feet pale yellowish, hairy ; tips of 

 femora and tibia? brown ; last joints of the tarsi brown. Tergum brown, pos- 

 terior margins of the segments a little paler ; ^ forceps tawny (fig. 10, and 

 10 a.) Wings hyaline, veins brown ; costal and subcostal tawny ; anterior mar- 

 gin distinctly pilose ; stigma distinct, brown, rounded, near the tip of the 

 subcostal vein ; the stigmatical cross-vein crosses it ; petiole arcuated, but 

 little shorter 4han the radial vein which appears as its prolongation in a 

 nearly straight line. (For the description of the neuration compare also the 

 generic characters.) 



Three $ and one 9 specimens. Washington and Trenton Falls, N. T., in 

 June, (nob.) Illinois (Mr. Kennicott. ) 



There is a slight difference in the form of the discal areolet of these four 

 specimens ; in one of the males the second lower discal cross-vein is nearer to 

 the upper discal cross-vein than in the others ; the areolet in this case appears 

 more square. 



Gnophomyia nob. 



Antenna? 16-jointed, setaceous ; first joint elongated, cylindrical, second 

 cyathiform ; the following joints oblong or subglobular, with moderate .verti- 

 cils. Proboscis short. Palpi of moderate length ; last joint longer than the 

 preceding. Front convex, eyes glabrous. Feet of moderate length, stout. 



1859.] 



