26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.80 



only very narrow lateral depressed margins; basal two-thirds of 

 third tergite closely finely striate, subopaque; rest polished; ovi- 

 positor sheaths very slender, distinctly longer than the body. 



Yellow-ferruginous; base of mandibles and the palpi yellowish 

 white; vertex rather brownish; antennae brown, scape and pedicel 

 testaceous ; legs jtestaceous, with fore and middle coxae and trochan- 

 ters paler ; wings distinctly a little dusky ; stigma brown with a pale 

 spot at base ; veins brown ; apex of abdomen more or less inf uscated. 



Type.—U.S.'NM. No. 43500. 



Type locality. — Coleta, Ala. 



Remarks. — Described from four female specimens, collected by 

 H. H. Smith at the type locality, and one additional female taken 

 by R. A. Cushman at Difficult Run, Va., July 30, 1920. This last 

 specimen is larger than the others, measuring 7.5 mm. in length, 

 and is even a little more coarsely sculptured. One paratype has 

 antennae 44-segmented ; in the other paratypes they are broken. 



16. MACROCENTRUS CANARSIAE, new species 



Rather similar to ancylivorus, but differing especially in the rela- 

 tively longer and narrower, and completely striate, second abdominal 

 tergite, in having lateral depressed margins of second tergite very 

 narrow at base, in the third tergite being closely finely striate on 

 basal half or more, and in the metacarpus extending well beyond 

 apex of radial cell. From insularis, to which it is even more closely 

 related, it differs as noted in the key. 



Female. — Length 4.8 mm. Eyes large ; temples and cheeks narrow, 

 receding; malar space scarcely as long as basal width of mandible; 

 face with only a few scattered weak punctures ; vertex rising but very 

 little above upper level of eyes ; longest segment of maxillary palpus 

 a little longer than second segment of flagellum and longer than scape 

 and pedicel combined; antennae 49-segmented. 



Thorax rather short ; prescutum usually not especially prominent ; 

 notauli foveolate and not distinctly confluent posteriorly; pro- 

 podeum reticulate posteriorly and weakly rugulose medially at base, 

 smooth laterally on basal half; mesopleura and metapleura mostly 

 smooth, with a few weak scattered punctures; longer calcarium of 

 posterior tibia very nearly half as long as basitarsus; apical teeth 

 of trochanters conspicuous ; radius arising from very slightly beyond 

 middle of stigma; radial cell ending well before extreme wing 

 apex; metacarpus extending length of second intercubitus beyond 

 apex of radial cell; first discoidal cell longer than first cubital; 

 second abscissa of cubitus about half as long as recurrent; sub- 

 median cell weakly hairy at apex; nervulus postf ureal by barely 



