RIIAPIITDOLABIS. 28T 



of a discal cell and by its coloring, their relationship in other 

 respects is so great that I have no hesitation in placing them in 

 the same genus. Should a more detailed study of the organiza- 

 tion of 7?. flaveola necessitate its separation, R. tenuipes should 

 be retained as the type of the genus. 



I am not aware of the existence of this genus in any other 

 country. 



The name Mhaphidolabis is derived from j3a<j>is, needle, and 

 xa/3ts, forceps. ^^_ 



Description of the species. 



1. R. tenuipes, n. sp. % and £• — Fusca, thoracis vittis fuscis ; alis 



immaculatis, cellula discoidali nulla. 

 Fnscons, thorax with fuscous stripes, wings immaculate ; no discal cell. 



Long. corp. 0.2. 



Head blackish-fuscous ; front gibbose, somewhat cinereous 

 along the eyes, darker in the middle ; antenna? and palpi black. 

 Thorax fuscous, very little shining, and with a slight hoary 

 bloom ; stripes dark brown, almost black ; the intermediate one 

 cuneiform, the lateral ones prolonged beyond the suture behind ; 

 in the darker specimens, the stripes are divided only by a grayish 

 bloom, visible at the humeri, and extending backwards in the 

 shape of* a line between the intermediate and the lateral stripes ; 

 in paler-coiored specimens the stripes are well marked upon a 

 pale brownish yellow ground. Pleurae, scutellum, and metathorax 

 brownish, more or less mixed with yellow. Ilaltercs infuscated, 

 pale at the base. Abdomen fuscous, with scattered pale hairs ; 

 forceps fuscous. Coxae yellowish, sometimes more or less tinged 

 with brown ; feet dark tawny ; femora pale at the base. On the 

 foremost pair of feet of the male the first joint of the tarsi is 

 considerably longer than the tibia ; the four following joints, 

 taken together, are much less than half the length of the first 

 joint ; nearly the same proportions prevail on the two other pairs 

 of feet, only the first tarsal joint is not much longer than the 

 tibia. Wings (Tab. II, fig. It) with a slight grayish tinge, im- 

 maculate, veins brown ; stigma long, very slightly tinged with 

 brownish ; the praefurca is short, arcuated ; its origin is a little 

 before the tip of the sixth longitudinal vein (for the details of the 

 venation compare the generic characters). 



Bab. Maryland ; Saratoga Springs, N. Y. 



