1896.] NATURAL SCIENCES OF PHILADELPHIA. 295 



Myzine emarginata n. sp. 



9 . — Black ; basal two-thirds of mandibles ; tibiae, tarsi and apex 

 of femora reddish ; a transverse, medially enlarged line across front, 

 a narrower one across occiput ; line on pronotum posteriorly and a 

 spot on each side anteriorly, spot on dorsulum medially, small one near 

 tegulse, line on scutellum and metanotum, tegulse at base, triangular 

 spot on mesopleurie, a large one on each postero-lateral angle of 

 middle segment, and a small elongate one above in the middle, rarely 

 absent, spot on fore femora beneath near apex, spot on medial and 

 hind femora above near apex, this spot sometimes extending on the 

 lower surface, fore tibise externally, broad transverse band on first 

 dorsal segment, sometimes emarginate anteriorly in the middle, the 

 second entirely except a narrow line at base and a transverse medial 

 line, these lines united so as to form a low X, the medial one not 

 extending to the sides, and apex of second, third and fifth with a 

 narrow, thrice emarginate line at apex, yellow, that on the fifth 

 irregular ; body sparsely clothed with griseous pubescence ; front 

 with large separated punctures, smooth medially, those of the vertex 

 and occiput very sparse ; clypeus rather sharply carinated down the 

 middle; pronotum and dorsulum much more sparsely, with large 

 punctures, those of the scutellum and mesopleurae closer ; middle 

 segment above finely punctured, in the middle somewhat roughened 

 posterior face above and at the sides with coarse transverse wrinkles, 

 at apex the wrinkles are longitudinal, sides very finely and obliquely 

 striated ; first dorsal segment punctured at the sides, the second 

 with fine sparse punctures, strong at sides, punctures of segments 3 

 and 4 fine and closer, of the fifth stronger, second ventral with large 

 sparse punctures, the remaining ventrals finely punctured at base, 

 coarsely at apex ; pygidial area covered with strong, longitudinally 

 parallel striae, the apex narrowly reddish ; wings light fusco hyaline, 

 with a broad fuscous streak running from stigma to apex of supe- 

 riors. Length 16-17 mm. 



Chapada (March to May). A series of males collected at Chapada 

 and Corumba (April), I place here with some doubt. 



$ . — Black ; abdomen iridescent ; clypeus, mandibles except apex, 

 inner orbits, spot on scape beneath, one over each antennae, line on 

 anterior and posterior margin of pronotum, that on anterior margin 

 interrupted medially, dorsulum medially, spot on scutellum and 

 metanotum, large spot on mesopleurae anteriorly and a small one 

 posteriorly, two parallel spots on upper surface of middle segment. 



