12 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



with long setae, in profile with apex prominent; malar space dis- 

 tinctly less than half as long as basal width of mandible ; lower tooth 

 of mandible much larger and longer than upper tooth; antennae 

 26- jointed, filiform. Thorax finely shagreened, scutellum and specu- 

 lum polished; propodeum with petiolar area rugulose and incom- 

 pletely defined medially, apical lateral areas also rugulose and 

 obscurely defined, other carinae absent ; areolet small, nearly triangu- 

 lar, nervulus interstitial, nervellus weakly broken below middle; 

 hind tibia and tarsus nearly equal in length, calcaria less than half 

 as long as basitarsus. Abdomen finely shagreened, short and broad ; 

 first tergite little longer than broad at apex, its sides straight and 

 strongly convergent basally, petiole strongly depressed, without dor- 

 sal carinae, spiracles slightly before middle; second tergite only a 

 little more than half as long as broad at base, others relatively even 

 shorter; ovipositor sheath nearly as long as first tergite. 



Black ; face, complete orbits, clypeus, and mandibles yellow ; scape 

 and pedicel largely yellow, flagellum brown above, ferruginous be- 

 low, yellowish toward base. Upper and lower margins of pronotum, 

 propleura, lines in positions of notauli, broad lateral margins of 

 mesoscutum, subalar tubercles, and margin of prepectus yellow; a 

 longitudinal mark on lower mesopleurum brownish (this is some- 

 times yellow and confluent with the prepectal margin) ; wings h3''a- 

 line, veins and stigma brown, base and apex of stigma, costa, and 

 tegulae yellowish; legs yellowish testaceous, tibiae and tarsi stra- 

 mineous, hind coxae black at extreme base above. Narrow lateral 

 margins of tergites beyond second (and sometimes very narrow api- 

 cal margins) pale, plica yellow, hypopygium brownish ferruginous 

 with narrow yellow margin. 



Male. — Abdomen much more slender, the first tergite nearly 

 twice as long as broad at apex, second three-fourths as long as broad 

 at base; apical tergite entirely concealed by seventh; genital sheath 

 very narrow, as long as second tergite. 



Yellow much more extensive than in female ; pronotum almost en- 

 tirely and lower pleura yellow ; scutellum brownish ; tergite 3 usu- 

 ally more or less j^ellow at base; tergite 8 entirely yellow; genital 

 sheath brownish testaceous. 



Type local'dy. — Brookings, S. Dak. 



T^ype.— U.S.N.M. No. 44071. 



Remarks. — Described from six females and ten males, all from the 

 type locality. A paratype of each sex is returned to the South 

 Dakota State Agricultural College at Brookings, S. Dak. 



LATHROLESTES MNEMONIC AE (Rohwer), new combination 



Sympherta mnemonicae Rohwer, Proc. Ent. Soc. Washington, vol. 16, p. 141, 

 1914. 



The complete triangular areola and the strongly defined apical 

 lateral area and lateral carinae constitute the only important differ- 



