THE CANADIAN ENTOMOLOGIST. 285 



A separate genus may have to be erected for the reception of 

 Cordleyi. 



Xanthidiuml Cordleyi, Ckll.— Ann. & Mag., N. H., XII, 445, 1903, 

 (?. 



Corvallis, Or., 3rd June, 1899. (Cordley.) 



Xanthidium citrhmm (Cress.). — Tr. Am. Ent. Soc, VII, p. 79, 1879, 

 ?■ 



Wash. (A. E. S. P.). 



Xanthidium civile (Cress.). — Tr. Am. Ent. Soc, VII, p. 78, 1879,^. 



Corvallis, Or., 3rd June, 1899. (Cordley.) 



Xanthidium modocorum, Ckll. — Ann. & Mag., N. H., XII^ p. 445, 



1903. $■ 



Corvallis, Or., June. (Cordley.) 



Xanthidium libatum (Cress.). — Tr. Am. Ent. Soc, VII. 80, 1879, 



9 $' 



Oregon. (Through Mr. Lovell.) ^ differs from Colorado co-types 



as follows : Metathorax with a median black line as wide as the flagel- 



lum ; abdominal bands yellowish-white. 



Xanthidium rivale (Cress.). — Tr. Am. Ent. Soc, VII, 79, 1879, S. 



Wash. (Am. Ent. Soc, Phi la.) 



JVbmada, Fabr.; Holonomada, Robt. {intercepta), and Nomadtcla, Ckll. 



(erytrochroa ). 



Abdomen with black bands (June) ?iigrodncta, Sm. 



Abdomen with a black band at apex of first abdominal 



segment Cressoni Trevoriatia, Ckll., n. subsp. 



Abdomen without black bands i. 



1. Abdomen with yellow spots on the second and third abdominal seg- 



ments ; more or less of a band on the fourth, etc; third antennal 

 joint about equal with the fourth ; a little yellow at lower corners 



of face. (May and June) 2. 



Abdomen without yellow spots or with small spots 3. 



2. Thorax almost entirely ferruginous Lewisii. 



Thorax almost entirely black, including scutellum...^'-;W^-'ra, Vier., n.sp. 

 Thorax almost eaitirely black ; scutellum ferruginous ; abdomen im- 

 maculate beneath vicinalis infrarubens, Ckll.> n. subsp. 



3. Abdomen without yellow spots 4. 



Abdomen with yellow spots (4 or 6), yellow at lower corners of face ; 



third antennal joint longer than the fourth 6. 



4. About 10 mm. long 5. 



About 8 mm. long ...,...., 7. 



August, 190^ 



