142 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



i. SCELIPHRONECHTHRUS FASCIATI, new species. 



Host. — Sceliphron (Pelopseus) fasciatus Lepeletier (det. W. H. 

 Ashmead); Santo Domingo; from collection of the U. S. National 

 Museum (pi. 11, fig. 5). 



Female. — Length of cephalothorax 1.38 mm., breadth at widest 

 point 1.36 mm., breadth of head 1.02 mm., distance between mandi- 

 bles 0.25 mm. Cephalothorax brownish, lighter on disk except in 

 front of spiracles, also lighter in front of mouth and mandibles, mar- 

 gins dark; enlarging obliquely from base to spiracles, widest just 

 behind spiracles, thence narrowing obliquely in wavy lines to man- 

 dibles, apically rounded; spiracles laterally prominent; mandibles 

 broad, armed with outward curving tooth on inner apical angle. 



Type.— Cat. No. 10128, U.S.N.M. 



18. Genus OPHTHALMOCHLUS Pierce (1908). 



Name derived from ocpdaX/xoc (eye) + o^oc (group), signifying the 

 typical strepsipteran cluster eye. 



Wings having seven primary veins, the third anal missing, with two 

 distal detached veins between the radius and medius, and one be- 

 tween the medius and cubitus; maxillae two-jointed; palpi four- 

 jointed; antennas four-jointed. 



Type of genus. — Ophthalmochlus duryi Pierce. The genus is parasitic 

 on the genus Priononyx and at present is confined to North America. 



i. OPHTHALMOCHLUS DURYI Pierce (1908). 



Acroschismus duryi Pierce, MS. (Dury, 1906.) 



Host. — Priononyx atrata Lepeletier; Cincinnati, Ohio, June 17 

 (female), August 16-September 21 (males, female). (PL 10, figs. 

 7, 8, 13). 



Male. — Length 2.5 mm.; head, prothorax, and mesothorax black; 

 antennae, legs, and metathorax velvety reddish brown; postlumbium 

 lighter, membranous; wings snowy white, venation very light. Head 

 transverse; vertex medianly produced in a high ridge, on each side of 

 which arise the antennae; mandibles chitinous, dark in basal half, 

 yellowish in apical half, very acute and curved near tip; palpi two- 

 jointed, black. Scutellum just reaching praescutum in a narrow 

 angle, which separates the scuti; postlumbium as in Acroschismus. 

 (Edeagus inflated at base of the general profile found in Acroschismus, 

 but very much narrowed at first angle, thence very straight, and near 

 apex abruptly and acutely bent upward, apex very acute. 



Triungulinid : Length 0.19 mm., length, including stylets, 0.27 mm., 

 breadth of head 0.06 mm., greatest breadth 0.09 mm., breadth of ninth 

 abdominal segment 0.05 mm. Characters very similar to those of 

 Leionotoxenos. 



