266 [April 



Genus PHYTODIETUS, Grav. 

 Phytodietus pleuralis. n. sp. 



Black ; face, mouth, base of antennae beneath, line on each side of mesotho- 

 rax, most of thorax beneath, scutellums, and apical margins of abdominal seg- 

 ments, white; most of legs pale ferruginous, posterior tibise and tarsi blackish, 

 the former with a broad whitish annulus ; wings hyaline. 



Male. — Black, shining; face, frontal orbits, clypeus. mandibles ex- 

 cept tips, lower half of the cheeks, and the palpi, white; antennae as 

 long as the body, slender, brownish, the two basal joints beneath, and 

 the third and fourth joints exteriorly, whitish. Thorax black, polished ; 

 mesothorax with a broad white line on each side, dilated and recurved 

 anteriorly; the tegulae, one or two spots beneath, lower margin of the 

 prothorax. the pectus entirely, and the pleura beneath and extending 

 up on each side anteriorly, white ; a minute spot on each side of the 

 scutellum at base, a spot on its tip, the postscutellum, and the posterior 

 margins of the spaces on each side, also white ; metathorax entirely 

 black, and covered with very fine transverse striae. Wings hyaline, 

 beautifully iridescent; nervures fuscous, pale yellowish at base; areolet 

 triangular, oblique. Legs : the four anterior coxae and trochanters, 

 second joint of posterior trochanters, and the four anterior femora, 

 tibiae and tarsi in front, white, tinged with pale ferruginous behind; 

 posterior coxae, first joint of their trochanters and their femora except 

 extreme tips, pale ferruginous; their tibiae and tarsi black, the former 

 with a broad annulus about the middle, and the latter at extreme base, 

 whitish. xVbdomen black, polished; the apical margin of all the seg- 

 ments with a narrow white fascia, broader on the extreme sides. Length 

 3 lines: expanse of wings 5* lines. 

 One specimen. 



Genus MESOCHORUS, Grav. 

 Mesochorus agilis, n. sp. 



Black ; most of mandibles and tegulae, yellow; clypeus, legs, and band on 

 abdomen, dull luteous ; wings hyaline. 



Female. — Black, polished, clothed with a short, fine, pale sericeous 

 pubescence; most of clypeus, extreme lower portion of the cheeks, 

 mandibles except tips, and the palpi yellowish, the two latter paler ; 

 antennae longer than the body, very slender, brown-black. Thorax 

 shining black; tegulae and a spot before, pale yellowish ; metathorax 

 shining, the elevated lines not well defined, the central area very elon- 

 gate. Wings very large and ample, hyaline, iridescent; nervures pale 

 fuscous, yellowish at base, as well as the costa and stigma ; areolet 

 rather large, rhomboidal. Legs obscure luteous, posterior coxae fuscous, 

 tips of their tibiae and their tarsi dusky. Abdomen piceous, polished ; 



