92 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



28. sparsipilosse Pierce, parasitic on A. sparsipilosa Viereck; Maine. 



29. subcandidse Pierce, parasitic on A. subcandida; Southern Cali- 



fornia. 



30. sweriki Pierce, parasitic on A. solidaginis Robertson; Nebraska, 



Pennsylvania. 



31. ventricosse. Pierce, parasitic on A. ventricosa Dours; Hungary. 



32. vicinse Pierce, parasitic on A. vicina Smith; New Hampshire, 



Connecticut, Canada, Massachusetts. 



33. viereclci Pierce, parasitic on A. texana profunda Viereck; Texas. 



34. oTclahomsR Pierce, parasitic on A. favoclypeata miserabilis Cresson; 



Oklahoma. 



The following names have been used in Stylops and are now 

 synonyms : 



dahlii Friese (1906) =dalii Curtis (1828), Pierce. 

 haworlH Stephens (1829) ^melittx Kirby (1802), Saunders, 1872. 

 lirbii Leach (1814) =melittse Kirby (1802), Saunders, 1872. 

 trimmerana Smith (1857) = aterrim a Newport (1847), Saunders, 1872. 



As the writer has seen none of the species hitherto described in the 

 genus, a table may be given here based on the illustrations of such 

 species. The onry available character in the illustrations is the 

 antenna. Hereafter species should also be separated by the shape 

 of the oedeagus and length of maxillary joints, as well as relative 

 lengths of antenna] joints. The thorax and wing venation may also 

 present good characters. 



Partial key of males. 



1. Fourth joint of antennae subequal to or greater than the following two together. . . 2. 

 Fourth joint not as great as the sum of the two following 5. 



2. Fourth joint about twice as great as the two following together, third not reaching 



sixth laterally melittse Kirby. 



Fourth joint hardly greater than sum of two following 3. 



3. Third joint laterally reaching beyond base of sixth, fifth and sixth subequal 



(Smith's 1857 and Griffith's 1832 figures disagree) childreni Gray. 



Third joint laterally not. reaching sixth 4. 



4. Fifth joint slightly longer than the sixth spencii Templeton. 



Sixth joint acuminate, longer than fifth dominiquei Pierce. 



5. Fourth and fifth joints subequal, shorter than sixth aterrima Newport. 



Fourth joint longer than fifth or sixth, sixth longer than fifth dalii Curtis. 



Fourth joint about twice as long as fifth, sixth longer than fifth craufordi Pierce. 



Key to females. 



In the genus Stylops the mandibles of the females show fewer 

 points of difference than in the xenid genera, so the best key for 

 differentiation of the species described herein will be one based on 

 the comparative measurements of the various dimensions of the 

 cephalothorax. In order to accurately study the females of the 



