DICRANOMYIA. 53 



auxiliary vein, the marginal cross-vein is sometimes at the tip, but 

 more often at some distance from the tip of the first longitudinal 

 vein, and the male forceps consists of two horny hooks (Limnobia, 

 Trochobola). Little is known about the forms of Limnobina 

 peculiar to the tropical regions and foreign to Europe and North 

 America. The Berlin Museum possesses several species from 

 Mexico and Brazil, with a supernumerary cross-vein in the sub- 

 marginal cell ; the auxiliary cross-vein has its tip nearly opposite 

 the origin of the second longitudinal vein ; the ungues have strong 

 and distinct teeth ; the wings are spotted. These species will 

 form a distinct genus. 1 Another, still more aberrant form from 

 South America, is represented by several species in the same 

 museum. In Mr. Bellardi's collection, in Turin, I have seen a 

 species from the Philippine Islands, remarkable for its coloring ; 

 it is black, with smoky wings ; the thorax is orange red. 



As far as I can judge from the description of the genus Periphe- 

 roptera Schiner ( Verh. Zool. Bot. Ges. etc. 1866, p. 933, and Reise 

 d. Novara, etc. Diptera, p. 47), it is only a form of JDicranomyia ; 

 the generic character will be found in the Appendix II. 



Gen. I. DICRANOMYIA. 



One submarginal cell ; four posterior cells ; discal cell present or absent ; 

 marginal cross-vein at the tip of the first longitudinal vein ; tip of the 

 auxiliary vein generally opposite or before the origin of the second longi- 

 tudinal vein, seldom beyond it (wings of Dicranomyice, Tab. I, fig. 1, 2, 3). 

 Antennae 14-jointed, joints subglobular, elliptical, or short subcylindrical. 

 Proboscis not longer than the head. Feet slender, tibiae without spurs at 

 the tip ; empodia indistinct or none. The forceps of the male consists of 

 two movable, soft, fleshy, subreniform lobes and a horny style under them 

 (Tab. Ill, fig. 2, 3, 5). 



Rostrum subcylindrical, projecting ; epistoma longer than 

 broad, narrowed at the sides; the narrow, linear, pubescent 

 flabs of the under lip project more or less beyond it. In D. 

 rostrifera, rostrum and proboscis are nearly as long as the head ; 

 usually, however, they are shorter; palpi short. Eyes large, 

 glabrous, front rather narrow. The antennae are comparatively 

 short, as they do not reach the root of the wings, when bent back- 

 wards ; the joints of the flagellum are subglobular or elliptical ; 



1 Limnobia diva Schiner {Reise d. Novara, Diptera, p. 46), from Brazil, ia 

 apparently a species of this kind. 



