124 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



attaining the bend of the femora when folded, narrowest just beyond 

 base, gradually flared toward apex; tarsi equaling tibia?, and similar 

 to preceding pairs. Genitalia with the ninth ventral segment appar- 

 ently uncovered, and apically cleft, forming two lobes, from between 

 which the siphonated oedeagus arises. "GEdeagus renexed and 

 apically protected by the overhanging tenth segment. The genital 

 pore through which the slender penis finds exit is situated at the basal 

 one-third of the upturned tip of the oedeagus on the inner angle" 

 (Pierce, 1908). 



Female. — Length of cephalothorax 1.61 mm., breadth at spiracles 

 1.39 mm., breadth at base of head 1.10 mm., distance between man- 

 dibles at base 0.23 mm. Cephalothorax light brownish, lighter at 

 apex; longer than broad, elongate subquadrate, slightly oblique at 

 sides; broadly, convexly truncate at apex, truncation more than one- 

 half the breadth at the spiracles; lateral margin sinuate with three 

 depressions, the last in front of the spiracles; spiracles not laterally 

 prominent; mandibles distant from lateral margins of head, subquad- 

 rate with inner angle receding and armed with an outward curved 

 tooth. 



Triungulinid : Length of body 0.22 mm., length including stylets 

 0.30 mm., breadth of head 0.06 mm., greatest breadth 0.07 mm., 

 breadth of ninth abdominal segment 0.04 mm. First eight segments 

 normal, ninth elongate, deeply emarginate for the tenth, which is 

 elongate and terminated by two stylet-bearing lobes, contiguous at 

 base. 



Type.— Cat. No. 9825 U.S.N.M. Cotype in collection of Charles 

 Dury at Cincinnati, Ohio. 



2. ACROSCHISMUS BRUESI, new species. 



Xenos bruesi Pierce in determinations. 



Host. — Polistes metricus Say. (det. W. II. Ashmead) ; Detroit, 

 Michigan; two specimens of male, several females (pi. 5, figs. 7, 10, 

 11; pi. 9, fig. 2). 



Named in honor of Mr. C. T. Brues, of Milwaukee, Wisconsin. 



Male. — Length 3.5-4 mm., antenna? 1.25 mm. Reddish brown: 

 antenna? brownish, cheeks black, front lighter, mouth parts fulvous, 

 eyes black. Scuti reddish brown, scutellum blackish, postlumbium 

 very light, postcutellum brown, lightening toward apex. Abdomen 

 and legs fulvous ; oedeagus glabrous, yellow; and claws yellow, pubes- 

 cent. Wings milky, with clear-white pubescence. Antenna? long, 

 equaling width of head, first joint obliquely truncated, second very 

 small, fourth joint surpassing third. Maxilla? with first joint short, 

 palpus narrowed at base and once and a half as long as preceding joint. 

 Mandibles about twice the length of second maxillary joint (palpus), 

 and not capable of reaching eyes. Thoracic structure similar to tljat 



