1864.] 318 



white as well as a narrow marginal line extending to the base of the 

 posterior wings; the carina on each side in front of the scutellum and 

 a spot on postscutellum, also white ; metathorax coarsely and conflu- 

 ently punctured, clothed with pale pubescence, the transverse carina in 

 front sharply defined, the lateral tubercles strongly developed and acute; 

 a broad, elongate mark on each side constricted and pointed before, two 

 short, approximate lines in front of the tubercles sometimes confluent 

 with them, and two broad lines covering the tubercles and extending 

 to the posterior margin where they become confluent with the lateral 

 marks, all white. Wings hyaline, sometimes faintly tinged with fus- 

 cous; nervures and stigma black; areolet minute, quadrate. Legs 

 long and slender, especially the posterior pair, pale yellowish ; the four 

 anterior coxi>? and trochanters and a broad line on the posterior coxa? 

 behind, white ; rest of the posterior coxae, their trochanters at base, 

 their femora entirely, the apical fourth of their tibiae, and extreme tips 

 of all the tarsi, black. Abdomen short, slender, fusiform, about as long 

 as the head and thorax, black, polished ; the peduncle, and apical mar- 

 gins of all the segments, broadly white. Length of body lines, of 

 antennae 7 lines, of posterior legs 10 lines; expanse of wings llj lines. 

 Hah. — Delaware. Dr. Thos. B. "Wilson. 



This is a very conspicuous species and readily distinguished by its 

 very elongate antennte and posterior legs, in which respect it resembles 

 certain species of the genus Arotes. 



2. Mesostenus albomaculatus. n. sp. 



Black; autennte with a broad white aiinulus ; orbits, spot ou clypeus and 

 mandibles, a round spot on the disk of thorax and several on the sides, scutel- 

 lum, two large oval spots on metathorax, and apical margins of the abdominal 

 segments, white; legs pale fulvous, posterior pair varied with black and white; 

 wings hyaline; ovipositor short. 



Female. — Black, slightly pubescent ; the orbits interrupted behind 

 and very broad on the cheeks, a spot on the clypeus, middle of man- 

 dibles and the palpi, white; antennae rather longer than the body, por- 

 rect, black, the 9th to 13th joints white, spotted beneath with black. 

 Thorax densely punctured, the dorsal lines rather deeply impressed in 

 front, obsolete behind ; a round spot on the disk of the mesothorax, 

 tegulae, an elongate spot before and another beneath the anterior wings, 

 a large spot just behind the posterior wings, another on each side of 



