56 DIPTERA OF NORTH AMERICA. [PART IV. 



under side, is the style (fig. 1 and 5a, e, and fig. 3, a), a horny 

 projection, characteristic of this group. 



The European species Dicr. autumnalis and D. stigmatica 

 (placed by Stseger in the genus Glochina) show a remarkable 

 modification in the male forceps. In D. stigmatica the fleshy 

 lobes are much larger than usual, and their skin is a delicate 

 whitish membrane (compare the figures given by me in the Stett. 

 Entomol. Zeitschr. 1854, Tab. I, fig. 5-T) ; their rostriform 

 appendages are very large, branched, antler-like ; below the, 

 lobes, there is a second, hairy, coriaceous forceps ; below this, 

 a pair of conical processes, clothed with long hair and pointing 

 towards each other ; the horny style is between them. D. autum- 

 nalis (1. c. fig. 6) has these conical processes largely developed ; 

 in other respects, its forceps has the ordinary structure. 



The ovipositor of Dicranomyia, among those of the other 

 sections of Tipulidse, is remarkable for its smallness. The upper 

 valves are short, narrow, arcuated, pointed ; the lower ones are 

 straight. The ovipositor of D. hseretica is exceedingly small. 



The coloring of the body in this genus is rather monotonous 

 and dull ; grayish, brownish or ochraceous ; without the well- 

 marked stripes, bands, and spots which adorn the body, the feet, 

 and the wings of Limnobia. Among nineteen species of North 

 American Dicranomyia only two, rather abnormal species in 

 more than one respect, have spotted wings (D. defuncta and D. 

 rara) ; a single species has them clouded (D. humidicola). In 

 Europe, Dicranomyiee with clouded wings seem to be more 

 numerous. The European D. ornata has handsomely banded 

 wings. However, I am not sufficiently acquainted with the 

 European fauna to make any general statement about the nume- 

 rical proportion between the species with immaculate and those 

 with clouded wings. 



The habits of the larvag are probably aquatic, or subaquatic. 

 I am not aware that any larva of this genus has been described, 

 but I have observed near Washington, D. C, a larva, which I 

 have every reason to suppose is that of D. defuncta. It lived 

 upon the wood-work of a mill-dam, with a stream of water con- 

 stantly passing over it. However, Mr. Winnertz reared D. dume- 

 torum from decaying beech stumps (Linnoea Entomol. VIII, p. 

 281). 



Dicranomyia probably occurs in all parts of the world, 



