312 T. D. A. COCKERELL. 



IVomada inlercepla Sm. % (T.). 



Vancouver Island. Is a Holonomada. Mandibles simple ; head 

 very hairy, supraclypeal area with a yellow spot; third antennal 

 joint longer than fourth ; pleura black, with a large yellow mark in 

 front ; metathorax with a yellow mark on each side ; apical plate 

 of abdomen narrow, broadly rounded, entire. 



IVomada (Gnathias) volatilis Sm. % (T.). 



Expanse about 18 mm; mandibles dentate; third antennal joint 

 conspicuously shorter than fourth ; mesothorax with two indistinct 

 red lines, scutellum red; tegulse red, yellowish in front; abdomen 

 shiny, its venter red, without yellow marks ; apical plate deeply 

 emarginate; b. n. passing far basad of t. m. 



Nomada (Guathias) albofasciata Sm. % (T.). 



Mandibles dentate; third antennal joint moderately shorter than 

 fourth ; b. n. passing far basad of t. m. ; apical plate deeply emar- 

 ginate. 

 IVomada (Nomadula) articulata Sm. % (T.). 



This is the species we have so named, but the type specimen has 

 the first t. c. reduced to a stump in one wing and wanting in the 

 other. Mandibles simple; third antennal joint shorter than fourth ; 

 b. n. just basad of t. m. ; abdomen strongly punctured, apical plate 

 emarginate. The specimen has been much broken, and mended. 

 Two specimens placed with the type are quite other species. 

 IVomada montezumia Sm. £ (T.). 



Face with an oblique yellow mark on each side; labrum and 

 cheeks below eyes with a dense white tomentum; third antennal 

 joint longer than fourth; b. n. meets t. m. ; abdomeu remarkably 

 hairy, except first segment, which is smooth and shining; ventral 

 surface covered with hair. The hind tarsus bears the pollen-body 

 of an Asclepiad. 



The following six species, from South America and Asia, all have 

 simple mandibles : 



IVomada advena Sm. 9. 



Colombia. Third antennal joint longer than fourth above, a little 

 shorter below ; third s. m. extremely long, narrowed quite two- 

 thirds above ; b. n. meeting t. m. on basad side ; abdomen slender 

 basally ; apex with a semilunar hairy area. 



