NO. 2242. MORPHOLOGY OF THE ^TREFiilFTERA—PlEROE. 461 



3. X. hruesi Pierce ; parasite of P. metricus Say ; Michigan. 



4. X. huhhardi Pierce; parasite of P. crinitus Felton; Florida. 



5. X. hunteri Pierce ; parasite of P. n. sp. near minor; Texas. 



6. X. jurinei Saunders; parasite of P. gallicus Linnaeus; Switzer- 

 land. 



7. X. rnaximus Pierce; parasite of P. ruhiginosus Lepeletier; 

 Texas. 



8. X. nigrescens Brues; parasite of P. ruhiginosus Lepeletier; 

 Louisiana, Texas. 



9. X. pallidus Brues; parasite of P. annularis Linnaeus; Texas, 

 Florida, Nebraska, District of Columbia. 



10. X. peckii Kirby; parasite of P. fuscai/us Fabricius; Massa- 

 chusetts. 



11. X. pecosensis Pierce; parasite of P. texanus Cresson; Texas. 



12. X. ruhiginosi Pierce; parasite of P. ruhiginosus Lepeletier; 

 Louisiana. 



13. X. texani Pierce ; parasite of P, texanus Cresson ; Texas. 



14. X. wheeleri Pierce; parasite of P. Tnetricus Say; Connecticut, 

 New York, District of Columbia. 



15. X. vesparum Rossi ; parasite of P. gallicus Linnaeus ; Europe. 



16. X. hohlsi Hoffman ; parasite of P. canadensis L. ; Paraguay. 



4. XENOS HUBBARDI Pierce. 



The mesostigmatal lobe of the male, ventral view, is figured in 

 Genera Insectorum, plate 1, figure 3, but not mentioned in the text. 



14. XENOS WHEELERI Pierce. 



Errata : Gen. Insect, pi. 2, unnumbered figure, for "XeJios roheeleri " read 

 " Xenos ivheeleri." 



15. XENOS VESPARUM Rossi. 



Plate 72, fig. 1. 



Errata : Bull. 66, p. 116, line 27, and p. 117, lines 6, 12, read " 1793 " for 



" 1790 " ; p. 117, line 13, read " 1794 " for " 1793." 

 Gen. Insect, pi. 1, unnumbered figure, for "Xenos resparuin " read "Xenos 



vesparum." 



An illustration is presented of the side view of a male from PoUstes 

 gallica diadema, collected at Innsbruck, Austria, by Mr. Karl 

 Hofeneder. 



16. XENOS BOHLSI Hoffman. 



Xenos hohlsi Hoffman, Zool. Anz., vol. 4.5, pp. 100-103, 106, figs. 1, 2. Nov. 



13, 1914. 



Host. — Polistes canadensis Linnaeus, Paraguay. 



Male. — Described from specimen extracted from puparium. 



Length of body, 4.5 mm. Breadth of head from eye to eye, 0.95 mm. 



Greatest breadth of thorax, 1 mm. Length of thorax above, 2.3 mm. 



