NO. 2242. MORPHOLOGY OF THE 8TREPSIPTERA— PIERCE. 



456 



Stylops in female characters. It is the smallest known parasite of 

 the genus Andrena and differs greatly in the proportions of the 

 cephalothorax ; although taken separately the various proportions 

 range within the variations of typical Stylops. The mandibles are 

 not dentate and the spiracles not prominent. It can not be sepa- 

 rated as a genus until the male is known. 



Species: 1. polemonii Pierce. 1909; Colorado; parasite on An- 

 drena polemonii Robertson. 



STYLOPS (KATASTYLOPS) POLEMONII Pierce. 



Table of measurements of female. 



Prostylops, new subgenus. 



I have separated off this subgenus because of the great difference 

 between its type, Stylops pilipedis Pierce, and the other species of 

 Stylops in female characters. It is the largest known parasite of 

 the genus Andrena, and differs greatly in the proportions of the 

 cephalothorax from other Stylops. The mandibles are not dentate 

 and the spiracles barely surpass the lateral margin. It can not be 

 separated as a genus until the male is known. 



Species: 1. pilipedis Pierce, 1911; China; parasite of Andrena 

 pilipes Fabricius. 



STYLOPS (PROSTYLOPS) PILIPEDIS Pierce. 



Table of measurements of female. 



12. NEOSTYLOPS, new genus. 



Type of the genus. — Neostylops crawfordi Pierce. 



Male. — Methathoracic scutum connected between praescutum and 

 scutellum. 



Female. — Cephalothorax with marginal, but not prominent 

 spiracles, and mandibles without teeth, or with but a single tooth 

 {solidulae). 



The genus probably includes several species still included in Stylops 

 sensu latiore, because the males are unknown. The differences in the 

 females recorded indicate that probably further subdivisions wiU 

 become necessary. 



