168 ENTOMOLOGICAL SOCIETY 



and leaving only a linear space between ; clypeus not separated from 

 face, except slightly at sides. Thorax closely punctate, without distinct 

 parapsidal furrows ; the mesopleura concave beneath the wings ; rneta- 

 thorax with the areola and petiolar area confluent, the lateral basal areas 

 complete, the lateral middle areas open outwardly, the longitudinal carina 

 being absent, the angular area or third pleural area distinct, but small ; 

 spiracles broadly oval. Wings hyaline, the stigma and veins, except the 

 subcostal, which is white, are dark brown; areolet petiolate ; transverse 

 median nervure in hind wings straight, not broken. Abdomen fusiform, 

 petiolate, and very finely coriaceous, about as longas the head and thorax 

 united, black, with the apical edge of the petiole, the foveolae of second 

 segment and its apical two-thirds, the third segment, except at extreme 

 base along the suture, and the following segments along the lateral ven 

 tral edges, as well as the venter, ferruginous ; the petiole is as long as the 

 hind coxae and trochanters combined, the spiracles small, round and placed 

 at its apical third, and from them extend a delicate carina to tip of seg 

 ment;, the third segment is about two-thirds the length of the second, 

 wider than long; the fourth is scarcely two-thirds the length of the third, 

 while the following are still shorter. 



Hab. Arlington, Mass. (Bred from an unknown Geometrid larva on 

 Betula alba.} 



(49) Ischnoscopus synchlorae, n. sp. 



<3\ Length 5.2 mm. Head, thorax, antennae, except the scape, hind 

 tibiae, except a narrow annulus at base, and tarsi, except a narrow an- 

 nulus at base, black; scape, abdomen and rest of legs, except as noted 

 below, rufous; mandibles, palpi, tegulae, anterior coxae and trochanters, 

 their tibiae outwardly and tarsi, middle knees, a streak on their tibiae out 

 wardly, as well as spurs and tarsi, white. Wings hyaline, the stigma and 

 nervures brown. 



Hab. Canobie Lake, N. H. (Bred from larva of Synchlora sp., the 

 old name for Aplodes.} 



(50) Mesochorus tachinae, n. sp. 



9- Length 4.5 mm. Stemmaticum. the occiput surrounding the fora 

 men; thorax, except posternum and anterior part of pronotum, and first 

 and second abdominal segments, black; head, except anterior orbits and 

 mouth-parts, which are white, antennae, except toward tips, legs, and 

 abdomen from apex of second segment, including the sheaths of oviposi 

 tor, honey-yellow; tegulae, anterior coxae and trochanters, white. Meta- 

 thorax polished, delicately, subobsoletely areolated, the middle area very 

 narrow. Wings hyaline, the stigma and veins brown, the costal vein 

 toward base, a spot between stigma and parastigma and the post-stigmal 

 vein, white. Abdomen smooth, the petiole twice as long as second seg 

 ment, with only two slight grooves above, just in front of the spiracles, 

 the third segment very slightly shorter than the second, the fourth about 



