Superfamily SIRICOIDEA 129 



Sirex latifasciatus Westwood, 1874. Thesaurus Ent. Oxon., p. 114. 6. 

 Urocenis riparius MacGillivray, 1893. Canad. Ent. 24: 244. 6. 



Taxonomy: Benson, 1943. Bui. Ent. Res. 34: 40. -Hies, 1946. Ent. News 57: 218 (adventive in 



Brazil). 

 Biology: Chapman, 1954. Ecology 35: 44 (summit-frequenting insects of western mountains). 

 taxodii (Ashmead). D. C. and Va. to Fla. w. to Mo. Host: Taxodimn distichuvi. 



Sirex taxodii Ashmead, 1904. Canad. Ent. 36: 63. 9, cJ. 



Genus XERIS Costa 



Xeris Costa 1894 Prospetto Imen. Ital. 3: 259. 



Type-species: Ichneumon spectiiim Linnaeus. Monotypic. 



Revision: Maa, 1949. Notes d'Ent. Chinoise (Mus. Heude) 13: 79-89. 

 morrisoni indecisus (MacGillivray). Idaho, Utah, Nev., B. C, Wash., Oreg., Calif. Host: Abies 

 concolor, A. graiidis, A. lasiocarpa, Larix occidentalis, Libocednis decurrens, Picea 

 sitchensis, Piniis contorta, P. ponderosa, Pseudotsuga meyiziesii, Tsnga heterophylla. 

 Urocerus iyidecisus MacGillivray, 1893. Canad. Ent. 25: 243. 6. 

 morrisoni morrisoni (Cresson). Colo., Ariz. Host: Abies concolor, Picea pungens, Pseudotsuga 

 menziesii. 

 Urocerus morrisoni Cresson, 1880. Amer. Ent. Soc, Trans. 8: 35. 9, 6. 

 spectrum spectrum (Linnaeus). N. B. to Wash. s. to Conn., Mich., Colo., Ariz., Calif.; Eurasia, 

 China, Formosa, N. Africa. Host: Abies lasiocarpa, Larix occidentalis, Picea pungens, 

 Pinus contorta, Pseudotsuga menziesii. Recorded from same host genera in Europe 

 and Asia. 

 Ichjieumon spectrum Linnaeus, 1758. Syst. Nat., Ed. 10, v. 1, p. 560. 9. 

 Sirex nanus Muller, 1776. Zool. Dan. Prodr. p. 151. 

 Sirex ernarginatus Fabricius, 1793. Ent. System., v. 2, p. 128. 

 Urocerus caudatus Cresson, 1865. Ent. Soc. Phila., Proc. 4: 247. 9. 

 Sirex melanclwlicus Westwood, 1874. Thesaurus Ent. Oxon, p. 116. i. 

 spectrum townesi Maa. Mont., B. C, Wash., Oreg., Nev., Calif. Host: Abies concolor, A. 



grandis, A. lasiocarpa, Picea sitchensis, Pinus contorta, Pseudotsuga menziesii, Tsuga 

 heterophylla. 

 Xeris spectrum townesi Maa, 1949. Notes d'Ent. Chinoise (Mus. Heude) 13: 88. 9, 6. 

 tarsalis (Cresson). Wash., Oreg., Calif; Mexico. Host: Cupressus macrocarpa. Thuja plicata?, 

 Juniperus occidentalis, Libocednis decurrens. 

 Urocerus tarsalis Cresson, 1880. Amer. Ent. Soc, Trans. 8: 52. 9. 

 Xeris macgillivrayi Bradley, 1913. Jour. Ent. and Zool. 5: 24. 9. 



Biology: Westcott, 1971. Pan-Pacific Ent. 47: 310 (host). 



Subfamily TREMICINAE 

 Genus TREMEX Jurine 



Tremex Jurine, 1807. Nouv. Method. Class. Hym. Dipt., p. 80. 



Type-species: Sirex fuscicomis Fabricius. Desig. by Latreille, 1810. 

 Xylotems Hartig, 1837. Fam. Blattwespen und Holzwespen, nebst Einleitung Naturgesch. 

 Hym., p. 385. Preocc. 



Type-species: Sirex fuscicomis Fabricius. Desig. by Rohwer, 1911. 

 Xyloeceniatium Heyden, 1868. Berlin. Ent. Ztschr. 2: 227. N. name for Xylotems Hartig. 



About 22 world species are recognized, only one of which is found in North America. Our 

 representative is extremely variable in coloration, and earlier authors designated races or sub- 

 species to distinguish these variant forms. 



columba (Linnaeus). N. S., N. B., and Que. to Fla. w. to the Rockies, Colo., Utah, Ariz., s. Calif. 

 Host: Acer, Ulmus, Quercus, Hicoria, Fagus, and probably other deciduous trees. 

 Usually in dead or dying trees. Pigeon tremex. 

 Sirex columba Linnaeus, 1763. Amoenitates Academicae, v. 6, p. 412. 9. 



