LIMNOBIA. 85 



14- (often apparently 15-) jointed. Feet comparatively strong ; tibiae 

 without spurs at the tip ; empodia indistinct or none ; ungues with several 

 teeth on the under side, giving them a pectinate appearance. The forceps 

 of the male consists of two horny, movable hooks, and a horny style under 

 them (Tab. Ill, fig. G and 7). 



This genus is closely allied to Dicranomyia, but can be easily 

 distinguished by the structure of the forceps of the male, and, in 

 most cases, by the greater length of the auxiliary vein, which 

 extends far beyond the origin of the praefurca and ends nearly 

 opposite the inner end of the submarginal cell. The European 

 L. macrosUgrna is the only species I know of, the auxiliary vein 

 of which extends but very little beyond the origin of the prcefurca; 

 but the marginal cross-vein of this species is situated about the 

 middle of the stigma and at some distance from the tip of the 

 first longitudinal vein, which is never the case among the Dicra- 

 nomyide. 



The first longitudinal vein of Limnobia is generally also longer 

 than that of Dicranomyia ; its tip is usually nearly opposite the 

 middle of the submarginal cell ; sometimes (as in L. parietina) 

 far beyond the middle. The discal cell is closed in all the species 

 which I have had occasion to examine. The marginal cross-vein 

 is either at the tip of the first longitudinal vein, or at some 

 distance from the tip. In the first case it often occurs that the 

 first longitudinal vein appears incurved towards the second, and 

 that the cross-vein seems to be placed between it and the costa 

 (this same structure occurs among the Dicranomyix). A more 

 detailed comparison between the venation of Limnobia and Di- 

 cranomyiGkhsiS been given above on page 5t. 



The Limnobise are generally larger and more strongly built 

 than the Dicranomyiae ; their rostrum and palpi are somewhat 

 longer ; the joints of the flagellum more elongated, especially 

 towards the tip ; the verticils longer ; the feet stouter, often more 

 hairy ; but all these characters are not of an absolute value. 



The ungues of Limnobia have several distinct, and very striking 

 teeth on the under side, which give them a pectinate appearance ; 

 in some species they reach to the middle of the unguis, in others 

 they extend almost to the end. 



The colors of the Limnobise arc for the most part bright and 

 striking, with well defined stripes on the thorax, bands on the 



