1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. G39 



MICRODUS Nees. 

 Microdus grapholithae n. sp. 



Female. — Length, 4f mm ; ovipositor, 4 mm . An elongated, slender form, 

 honey -yellow ; eyes purplish; antennae black above, yellow beneath ; 



tarsi, except the last joint, white; the posterior femora have a black 

 spot above at apex, their tibiae and spurs white, the former with a black 

 spot on upper surface at base and the apex black; the tarsi black, the 

 1st joint at base and the following joints ringed with white; metatho- 

 rax rugose with lateral keels and two parallel keels on the disk ; abdo- 

 men long, linear, slightly longer than the head and thorax together, 

 smooth, polished, the segments hardly distinguishable; ovipositor 

 black; wings hyaline; costte and stigma black; veins yellowish ; the 

 areolet triangular; the cubitus or the vein separating the 1st discoidal 

 and 1st submarginal vein is not entirely obliterated, the basal portion 

 remaining, so that while the 1st submarginal and 1st discoidal cells are 

 confluent they are partially separated. 



The male agrees with the female structurally, only the head is 

 brownish on vertex ; the disk of metathorax, 1st abdominal segment, 

 and the apex of the abdomen black. 



Habitat.— Kirk wood, Missouri. 



Described from two specimens, one male and one female, received 

 from Miss Mary E. Murtfeldt, labeled "Parasite on Grapliolitha mala- 

 chitana Zell." 



The species seems to be nearly related to Microtias pallens Cress. 



Microdus albocinctus n. sp. 



Female.— Length, 5£ mm ; ovipositor, 4 ,nm . Polished black; antenna} 

 involuted at tips, brown, the scape basally and the apex of the 2d joint 

 yellowish; mandibles and palpi white; mesopleura, metapleura, and 

 legs honey-yellow; the posterior legs are aunulated with white and 

 marked as in previous species; the cheeks superiorly are angularly pro- 

 duced posteriorly, a peculiarity never noticed in other species, and mav 

 prove to be a deformation in this one. The parapsidal grooves are deep, 

 punctulate at bottom ; pleura very hairy ; metathorax rugose with some 

 raised lines; abdomen linear, as long as the head and thorax together, 

 ad shining, but the 1st segment is delicately longitudinally aciculated, 

 and the 2d segment delicately shagreeued. Wings hyaline; cost* and 

 stigma dark brown ; the other veins paler ; venation normal. 



Habitat.— Kirk wood, Missouri. 



Described from a single specimen labeled "Parasite on a Toruicid 

 on chestnut, June 20, 1886." 



Seems to be allied to Microtias annulipes Cress., but the wholly black 

 abdomen and its sculpture will at once separate it. 



Microdus aciculatus n. sp. 



Male and female.— Length,! to 4* mm ; ovipositor,!""". Black, polished, 

 sparsely punctulate ; antenna}, palpi, aud legs, excepting tibial spurs 



