AMERICAN HYMENOPTERA. 377 



List of the North American species of the Genus ALEIODES, Wesmael. 



15Y E. T. CRFSSON. 



The following table will assist in determining the species. 



Wings fuliginous : 

 Black; metathnrax and abdomen ferruginous: 



Legs black, posterior coxse ferruginous 1, taxanus. 



Legs black, posterior coxte and base of femora ferruginous. ..2. fumiponnis. 



Yellow; head, collar, antcnnte and legs black 3. mexicanus. 



Wings fasciate with blackish: 

 Whitish; head dusky; mesothorax, tips of posterior femora and tibiae and 

 apex of abdomen more or less tinged with honey-yellow. ..4. fascipennis. 



Yellow; head, antennse and apical halfof four hinder legs black 5. pec*alis. 



Wings yellow, apex fusrous ; body pale honey-yellow; antennoe, apical halfof 



posterior tibioe and whole of their tarsi black 6. flavidus. 



Wings hyaline : 

 Eed, or yellow, and black species : 

 Black: four anterior legs, posterior coxae, trochanters and femora, except 

 tips, and two basal segments of abdomen ferruginous; anteunos fuscous, 



posterior tibiae with a whitish annulus at base 7. terminalis. 



Black; legs and abdomen ferruginous, apex of latter generally more or less 



blackish 8. abdominilis. 



Black; legs and three basal segments of abdomen ferruginous; apex of ab- 

 domen black, covered with a dense changeable silvery pile 9. lectus. 



Ferruginous; head, metathorax, apex of abdomen, and tips of jjosterior 



femora and tibiae black 10. parasiticus. 



Ferruginous; head and antennie black 11. atriceps. 



Yellowish, varied with fusco-forruginous ; metathorax, part of pleura, first 

 abdominal segment, exce[)t tip, and sides of second and third segments, 



black 12. intsrmedius. 



Dullluteous; head above, collar, spot beneath wings, mesothorax, meta- 

 thorax, first abdominal segment, except tip, and broad lateral margin of 



second and third segments, black 13. canadensis. 



Yellowish-white; spot covering scutelluins and base of metathorax, spot 

 beneath wings and a large mark on abdomen above, covering second, 

 third and apex of first segments, black ; wings with a faint fuscous cloud 



about the middle, stigma large, black 14. discoideus. 



Yellowish-white; collar, three lines on mesothora.x, large transverse maric 

 on metathorax, large spot on jileura, base of posterior coxae, tips of their 

 femora, tips of all the tarsi, and abdomen above, except large whitish 



spot at base of second segment, black 15. ornatas. 



Ferruginous, or honey-yellow species: 



Dull ferruginous; thora.x more or less stained with fuscous; antennae of 

 both sexes fuscous or black; whole of third abdominal segment acicu- 



late; eyes short, ovate, scarcely emarginute within 16. fulvus. 



Dull honey-yellow, more or less varied with fuscous; whole of third and 

 fourth abdominal segments above aeiculate: eyes short, almost circular, 



not emarginate 17. aoiculatus. 



Dull ferruginous; thorax sometimes varied with fuscous; antennae of $ 

 pale honey-yellow, of % black, with a broad yellowish annulus; base 

 only of third abdominal segment aeiculate; eyes as in fulvus..lS. burrua. 



TRANS. AMER. ENT. SOC. (49) NOVEMBER, 18C9. 



