1865.] 



'11 



the middle of the posterior face two longitudinal whitish lines com- 

 mencing at the transverse carina, their anterior half narrow, their pos- 

 terior half suddenly dilated and covering the spines, and on each ex- 

 treme side posteriorly a whitish spot. Wings hyaline, slightly smoky 

 at extreme tips, nervures and stigma blackish. Legs long, rather 

 slender, pale honey-yellow, including the coxae ; posterior femora at 

 tip above, apical two-thirds of their tibiae, and the tips of all the tarsi, 

 black ; the coxae and femora more deeply colored than the remainder 

 of the legs. Abdomen rather short, fusiform, slightly compressed at 

 tip, polished ; basal segment longer than the second, white, with a 

 broad black band near the tip ; remaining segments black, rather 

 broadly margined at tip with white. Length 62 lines; expanse of 

 wings 11 2 lines. 



Collection. — Dr. J. Grundlach. One specimen. 



This may be the male of M. robuxtus ; the hind legs are, however, 

 differently colored and the thorax somewhat diiferently marked. 



Mesostenus tarsatus, n. sp. 



Black ; mesothorax brown ; face, orbits, annulus on antennae, spot on meso- 

 thorax, most of pectus and pleura, scutellum, posterior face and sides of meta- 

 thorax, four anterior coxae, and apical margins of abdominal segments, white; 

 legs fulvous, hind tarsi black with a broad white annulus; wings hyaline, iri- 

 descent; metathorax not spinose. 



Female. — Head white; abroad brownish, longitudinal band extend- 

 ing posteriorly, from the base of the antennae, covering the ocelli and 

 spreading on the occiput; most of mandibles and a spot above their 

 base, black ; eyes large and prominent, brown ; antennae slender, as long 

 as the body, black, with a broad white annulus beyond the middle, and 

 the basal joint beneath with a white line. Thorax : mesothorax mi- 

 nutely punctured, reddish-brown, with a rounded white spot on the 

 disk, the dorsal lines well impressed; pectus dark brown, with a large 

 white spot above each anterior coxa; pleura very finely aciculate, white 

 on the sides and beneath, the anterior and posterior margins blackish ; 

 tegulae, a line before and a spot beneath the anterior wing and a large 

 spot behind the posterior wing, white ; scutellum and postscutellum 

 white, the space on each side black ; metathorax without spines, brown- 

 ish or reddish-brown, its posterior face entirely and its sides, white, on 

 the middle a well defined, transverse carina, and just behind it on the 

 declivity another transverse carina which is slightly prominent on each 

 side where the spines are generally situated, between these two carina 1 , 

 the surface is longitudinally aciculate, the remainder of the posterior 

 face is transversely aciculate, in front of the first carina the surface is 

 finely punctured and almost smooth. Wings hyaline, iridescent, faintly 



