i40 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



oblique but very nearly straight from spiracles to base of head, a 

 small abrupt emargination at base of head, thence very oblique, 

 straight to mandibles, apex convex; spiracles dorsal, showing light 

 on dark background; mandibles broad, apicalry emarginate between 

 the long curved tooth on the inner angle and the obtuse outer angle. 



Triungulinid : Length 0.25 mm., length including st}iets 0.34 mm., 

 breadth of head 0.07 mm., greatest breadth 0.10 mm., breadth ninth 

 segment 0.06 mm. Similar to that of Leionotoxenos. 



Type.— -Cat. No. 10122, U.S.N.M. 



Named in honor of Mr. Fred C. Bishopp, one of the writer's asso- 

 ciates, who has been of great assistance in obtaining material for 

 study. 



3. PARAXENINI, new tribe. 



Pseudoxenides (part) Saunders, 1872. 



Parasitic on Bernbecidae. 



The tribe includes one genus: Paraxenos Saunders (1872), para- 

 sitic on Bembecinus; Europe. 



16. Genus PARAXENOS Saunders (1872). 



Name derived from -apd (near) + Xenos, meaning related to Xenos. 



Type of genus. — Paraxenos erberi Saunders (1872). 



This genus is typically parasitic on the genus Bembecinus, and at 

 present is known only from Europe. 



The following description is taken from Saunders: 



Maxillae with basal joint stout, arcuate; palpus cylindrical, pubes- 

 cent, deflexed. Mandibles broader at base, internally strongly 

 emarginate. Antennae with first joint short apically dilated, with 

 internal angle prominent; second small, subcuneif orm ; third inter- 

 nally produced into a flabellum, dilated to basal quarter, thence 

 compressed, apically more slender, obtuse; fourth elongate, basally 

 dilated, apically subobtuse, more or less exceeding the branch of the 

 preceding in length. Wings with radius remote from subcosta, 

 subabbreviated ; costal area clouded; medius sinuate; a detached 

 branch of radius and one of medius between these veins; cubitus 

 delicate; the three anal veins subapproximate, thickened slightly at 

 base. Legs with anterior trochanters, femora, and tibiae subequal; 

 tarsal joints almost alike, the basal more robust, the apical more 

 slender; middle pair almost the same; posterior coxae reniform, with 

 trochanters subovate, robust; tibiae more slender. 



° Palpi articulo basali crasso, arcuato; secundo cylindrico, hirto, deflexo. Mandi- 

 bular basi latiores, interne fortiter emarginatse. Antenna? 4-articulatse: articulo 

 primo brevi, apice dilatato, angulo interno prominulo, tertii cubitum versus porrecto: 

 secundo minimo, subcuneiformi, lateribus angulatis: tertis in ramum internum 

 producto, basi externe dilatatum ad quartum recipiendum, deinde subito rectangu- 



