96 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



Further amplification of this description may consist in the fol- 

 lowing, drawn from the illustrations of the species (Curtis, 1828; 

 Smith, 1857): Third joint of antennae laterally reaching about to 

 middle of sixth ; fourth and sixth subequal, and a little longer than fifth. 



3. STYLOPS CHILDRENI Gray (Griffith, 1832). 



Stylops childreni Smith, 1857. —Saunders, 1872. — Pierce, 1908. 



Host. — Andrena victima (?) Smith; Nova Scotia. 



Type in British Museum. 



According to Saunders it may be described as follows: 



Male. — Sooty black, with antennae and maxillae piceous, abdomen 

 luteopiceous ; feet ' rufescent ; wings pale fuscous, iridescent, with 

 anterior margin darker." 



From Smith's (1857) drawing of the type the following characters 

 may be assumed: Third joint of antennae laterally almost reaching 

 tip of sixth; first joint short, not much longer than sixth; fourth 

 subequal to fifth plus sixth. 



The typical species has not been found in this country since its 

 first record. It must be thoroughly understood that the writer has 

 found no species parasitic on two distinct species of Andrena. Pack- 

 ard's references to Stylops childreni were based on parasites of 

 Andrena placida in Massachusetts, to which species the writer gives 

 the name Stylops packardi, and upon parasites of Andrena vicina in 

 Massachusetts which the writer herein describes as Stylops mcinse. 



4. STYLOPS SPENCII Pickering (1835). 



Stylops spencii Westwood, 1840.— Saunders, 1872. — Pierce, 1908. 

 Stylops melittse Nassonow, 1893a. 

 Stylops melittx spencei Friese, 1906. 



Host. — Andrena tibialis Kirb3 r ; England, Germany. 

 The original description by Pickering is as follows : 



Hale. — Specifically distinguished by its comparatively large size; dark wings, 

 marked with strong black nervures; basal joint of antennae produced obliquely inter- 

 nally to a considerable distance beyond the insertion of the second joint; by the 

 shape of the wings, which are produced at the external anterior angle to a point (not 

 literally true) and are very broad and rounded behind; and by the pitchy red anus. 

 (Pickering, 1835.) 



From the figures of the species published by Pickering the follow- 

 ing may be added: Third joint of antennae not attaining tip of fifth, 

 fourth joint greater than fifth plus sixth. Mandibles short, slender, 

 and very acute, slightly longer than first joint of maxillae. Maxillae 

 two jointed on a tuberculate base, with second joint once and one- 

 half longer than first. 



aMale. — Fuliginosa, antennis palpisque piceis; abdomine luteopiceo; pedibus 

 rufescentibus; alis pallide fuscis, iridescentibus, margine antico obscuriore. (Saun- 

 ders, 1872.) 



