PARASITIC HYMENOPTERA. 233 



Hub. — Algonquin, III. 



Described from two % specimens collecte^l by Dr. \\\\\. A. Na.<on, 

 July -Ir, and 31, 1894. 



DECODES Forster. 



Secofles phl«eutribi sj). n. 



9 . -Length 1.5 mm. CtBiiileus, the disc of mesonotum and the scutellura with 

 an seneous tinge; coxse and femora, except tips, bluish; scape, tips of coxa, tro- 

 cbantere, tips of femora and the tibise and tarsi, except last joint, honey-yellow 

 or yellowish, the tarsi a little paler or yellowish white; flagellum brown-black, 

 subdavate, pubescent. Wings hyaline, the veins yellowish, the pubescence very 

 fine and arranged in little irregular lines ; stigmal vein very short, but terminating 

 in rather a large oval knob, .\bdomen conic-ovate, as long, or a little longer than 

 the head and thorax united. 



The % is more of an aineous-black. the sides of thorax and abdomen beneath 

 blue; the tibia;, except distal ends, are brown, while the abdomen is oblong, nar- 

 rowed towards base. 



if«6.— Roslyn, Va, 



Described from one % and one 9 bred June 18, 1894, from the 

 larva of a beetle Phlceoinbiis frontalis Oliv. 



The % , unfortunately, has the antenme broken off, and these im- 

 portant organs, in con-seijuence, are not described. 



Subfamily Tktrastichix.e. 



Tfr:TKASTI€IIIJS Haliday. 

 TetrastieliiiN joliu»»oiii sp. n. 



9-— Length 1.25 mm. Polished black, the hairs on head and thorax black; 

 scape, trochanters, except second joint of middle legs, tips of femora and all tibiai 

 and tarsi, honey-yellow; flagellum black, three or more times longer than the 

 scape, clothed with a sparse, whitish pubescence, the pedicel and fii-st funicular 

 joint united alone a little longer than the scape, funicular joints 2 and 3 abi)ut 

 equal in length, a little shorter than the lii-st, the fii-st being the longest joint, and 

 about four times as long as thick. Head transvei-se, autero-posteriorly very nar- 

 row, with a deep frontal emargination ; mesonotum a little wider than long, 

 smooth, but with deep parapsidal furrows; the collar anteriorly and at side.s, 

 episterna, anterior margin of mesopleura and the metanotum feebly shagreened, 

 the latter short, with a median carina and distinct, rounded spiracles, which are 

 bounded behind by a raised curved line ; teguhe piceous black. Wings hyaline, 

 iridescent, pube-scent, the marginal cilia of hind wings longer than on the ante- 

 rior wings; veins brown, the submarginal vein two-thirds the length of the mai-- 

 giui'l, the former with one long bristle just before its middle. Abdomeu oval, 

 not longer than the thorax, the tiret body segment occupying about one-third the 

 whole surface, all the following segments short, subequal. 



i/u7>.— Urbana, 111. 



Described from si.x 9 specimens bred by Mr. W. (J. ddhnson, 

 July 80, 1^95, from a mud wasp's nest, l\)inpiln.-< sp. 



TRANS. AM. KNT. SOC. XXIII. (30) JULY. lS96 



