$8 W. Dzvight Pierce 



EXPLANATION OF PLATES 

 Plate I. Figures Drawn by W. Dwight Pierce 



Fig. 1. Xenos pulvinipes Pierce. Type male. West Point, Neb., August 

 10, 1903, from Panwfgint& sp. ; b, antenna; c, left elytron; d, posterior leg; 

 e, anterior leg; f, median leg; g, genitalia from side view. 



Fig. 2. Diagrammatic forms of stylopid antennae, a, Stylops; b, Xenos; 

 c, El e minis; d, Halictophagus. 



Fig. 3. Myodites solidaginis Pierce, a, Triunguloid, ventral view; b, pos- 

 terior leg; c, coxa from above by optical section; d, pulvillus and tarsal 

 claw from side view; e, pulvillus from above; _/", mouth-parts, ventral. Ac- 

 tual size, 82 mm. 



Fig. i. Female stylopid from Andrena solidaginis; August 30, 1903, Lin- 

 coln, b, head, ventral; c, female from Andrena solidaginis, September, 

 Lincoln; head showing young within. 



Fig. 5. Xenos sp. from Polistes sp.; Hat creek valley, Nebraska, August. 

 a, Pupa of male; b, presumably larval head of male; c, head of female. 



Fig. 6. Xenos pulvinipes. Type female, West Point, Neb., August 10, 

 1903, from Pantirginus sp.; head. 



Fig. 7. Stylopid female from Andrena illinoiensis, April, Lincoln. 



Fig. 8. Rhipiphorus aculipennis. a, Ventral view of thorax. 



Note — Fig. 8b and Fig. 9 are missing. 



Fig. 10. Myodiles fasciaius bruuneus, posterior tarsus. 



Fig. 11. Myodites minimus, posterior tarsus. 



Fig. 12. Myodites solidaginis, posterior tarsus; b, claw. 



Fig. 13. Stylopid triunguloid extracted from parent, taken in body of An- 

 drena solidaginis; Lincoln, September. Actual size .158 mm. 



Fig. 14. Meloid triungulin from Andrena sp., Pullman, Washington. Ac- 

 tual size, excluding stylets, 1.35 mm. 



Fig. 15. Meloid triungulin from Andrena sp. nov.; Lewiston, Idaho (five 

 specimens taken from one bee). Actual size, excluding stylets, .55 mm. 



Plate II. Figures from Packard 



Fig. 1. Oil beetle, a, First larva; b, second larva; c, third larva; d, pupa. 



Fig 2. Sitatis. a, Triungulin; g, anal spinnerets of same; b, second larva; 

 c, true pupa; d, female adult; e , pseudopupa; f, third larva. — [After Mayet 

 from Packard.] 



Fig. 3. Triunguloid of Stylops childreni. 



Fig. 4. Stylops childreni, male, a, Abdomen of Andrena with female 

 Stylops {b). 



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