298 [April 



or blackish. Abdomen rather short, broad and subcompressed towards 

 the apex, orange-yellow, smooth and polished ; two basal segments de- 

 pressed above, the first excavated at base with a stout tubercle on each 

 side; the incisure between the first and second segments with a deep 

 fovea on each side; venter tinged with pale yellowish, apex gapping, 

 ovipositor scarcely exserted. Length 3f lines; expanse <it' wings 7 lines. 

 One specimen. 



2. Microdus medius. n. sp. 



Yellowish-red ; head, antennae, pectus, pleura, scutellum, metathorax and 

 base of legs, black; wings uniform fuliginous, with a large hyaline patch be- 

 neath the stigma. 



Male. — Yellowish-red. polished, slightly pubescent; head entirely 

 black; antennae two-thirds the length of the body, entirely black. 

 Thorax impunctured, the sutures finely crenulated ; mesothorax promi- 

 nently trilobed, behind the middle lobe, a deep excavation ; pectus, pleura, 

 except a spot beneath the tegulae, scutellum and metathorax, black, the 

 latter densely and finely rugose; tegulae honey-yellow. Wings ample, 

 uniform dark fuliginous, with a Luge hyaline patch beneath the stigma ; 

 nervures black ; areolet minute, petiolated and slightly oblique. Legs 

 houey-yellow ; all the coxae and trochanters and base of the femora, 

 tips of the four anterior tarsi, tips of the posterior tibiae, and their tarsi 

 entirely, black or blackisb. Abdomen subsessile. oblong-ovate, much 

 depressed, smooth and polished, much narrowed at base; first segment 

 excavated at base with a stout tubercle on each side; second segment 

 broadly excavated on each side at base; venter paler. Length 3} lines; 

 expanse of wings 7] lines. 



One specimen. This species bears a close resemblance in form and 

 color to Ayathis media described above. 



3. Microdus terminatus, n. sp. 



Honey-yellow ; antenna;, and apex of abdomen, black; abdomen nearly ses- 

 sile; wings uniform fuliginous. 



Male. — Honey-yellow, polished.; head small, mouth blackish; an- 

 tennae nearly as long as the body, entirely piceous-black. Thorax : 

 mesothorax trilobed, the middle lobe broad in front, with two subobso- 

 lete medial grooves ; postscutellum and the space on each side, black- 

 ish, as well as the pleura beneath between the four anterior legs ; meta- 

 thorax finely rugose, dusky ferruginous, the disk with a coarsely rugose, 

 blackish, longitudinal space ; tegulae honey-yellow. Wings uniform 

 fuliginous, with two subhyaline spots beneath the stigma; nervures 

 black ; areolet minute, triangular, petiolated. Legs color of the body ; 

 four anterior coxse, all the trochanters and tarsi, extreme tips of the 



