FAM. XEXIDvE 23 



jointed, sensitive, with third joint laterally produced. Prothorax and mesothorax transverse, the latter 

 twice as long as the former. Metathorax with praescutum much broader in front than behind, posterior 

 edge squarely truncate; scuti widely separated; scutellum longer than praescutum, sides sinuately 

 narrowing toward front, but not becoming approximate; postlumbium very long. Tarsi four-jointed. 

 GEdeagus beginning as a slender tube, then greatly inflated, bent at right angles, and produced as a 

 very slender process. 



Female. — Cephalothorax broad, trapezoidal, prominent at spiracles, thence gently arcuate to 

 apex, which is broadly truncate. Mandibles rather widely separated, triangular, toothed. 



Type of genus. — C. pulvinipes, Pierce. 



Geographical distribution of species. - Parasites of Panurgine bees of the genus 

 Panurginus. 



i. C. cockerelli, Pierce, Bull. U. S. Nat. Mus.no. 66, p. i55, pi. 12, f. 8(1909). New Mexico. 



2. C. pulvinipes, Pierce. — PI. 2, Fig. 4; PI. 4, Fig. 23. Nebraska. 



Xenos pulvinipes. Pierce, Nebraska University Studies, pp. 1S-17, pi. 1, 



ff. 111-1/(1904). 

 C. pulvinipes. Pierce, Bull. U. S. Nat. Mus, no. 66. pp. i53-i55, pi. 12, 

 f. 7; pi. i3, ff 4-7 (1909). 



Parasites of Panurgine bees of the genus Pseudopanurgus : 



3. C. labrosi, Pierce, Proc. U. S. Nat. Mus. Vol. 40, p. 497 (1911). Illinois. 



4. C. rudbeckiae. Pierce, ibidem, p. 497(1911). Illinois. 



3. SUBFAM. XENIN/E, Pierce 



Xeninse. Pierce, Proc. Ent. Soc.Wash. Vol. 9, p. 78(1908) ; Bull. U. S. Nat. Mus. no. 66, p. 116 (1909). 



Characters. — Male. — Maxillae two-jointed. Metathoracic scutellum pedunculate anteriorly, 

 postlumbium short and transverse. CEdeagus inflated at basal angle, sharply angulate at apical third. 



Female. — Cephalothorax with head not considerably narrower than metathorax at spiracles, and 

 laterally not extending back more than two-thirds of the distance to the spiracles. Four genital tubes 

 entering brood-canal. 



The subfamily contains thirteen genera which can only be temporarily arranged until more is 

 known of them. This classification is necessarily unsatisfactory. 



TABLE OF TRIBES AND GENERA 



ia. Parasites of Vespidae 1. Tribus Xenini, Pierce. 



2a. Males known; parasites of Polistes. Wings having eight 

 primary veins from base, the third anal sometimes indistinct, 

 radius sometimes broken for a short distance, one detached 

 vein between radius and inedius, and one behind medius. . 1. Genus Xenos, Rossi. 



2b. Males unknown; parasites of Vespa 2. Genus Vesp/EXENOs, Pierce. 



2C Males unknown; parasites of Belonogaster 3. Genus Belonogastechthus, Pierce. 



lb. Parasites of Eumenidae 2. Tribus Pseudoxenini, Pierce. 



3a. Males known; parasites of Odynerus. Wings having eight 

 primary veins from base, and with two detached veins 



between radius and medius 1. Genus Pseudoxenos, Saunders. 



3b. Males unknown; parasites of Monobia 2. Genus Monobiaphila, Pierce. 



