310 T. D. A. COCKERELL. 



The following abbreviations are used : (T.) = type specimen ex- 

 amined ; s. m. = submarginal cell; r. n. = recurrent nervure ; b. 

 n. = basal nervure; t. c. = transverso cubital nervure; t. m. = 

 transverso- medial nervure; hind spur = hind spur of hind tibia; 

 area = basal area of metathorax ; abd. s. = abdominal segment. 



NO HAD A Fabr. 

 Nomada valida Sm. 9 (T.). 



A comparatively large, red and black, Nomada s. str. ; expanse 

 about 17 J mm.; mandibles simple; scape with dark hairs; third 

 antennal joint nearly as long as fourth ; third s. m. much narrower 

 above than second ; b. n. very slightly basad of t. m. ; metathorax 

 black, with a large red spot on each side of area, and a minute red 

 dot on each lateral area ; basal half of first abd. s. black right 

 across; pygidial plate very broad and rounded. 



Nomada americana Kirby. 



The type is not in the collection. The specimens under this name 

 are a mixture of Nomada s. str. and Gnathias, but include no Noma- 

 dula. Our so called Nomada americana will have to be called JV. 

 articulata Sm. 



Nomada imbricata Sm. 9 (T.). 



Expanse about 18 mm. ; mandibles simple ; labrum pale yellow, 

 not toothed ; head red, a round yellow spot below each antenna, and 

 below each of these a smaller black spot on clypeal margin ; third 

 antennal joint slightly shorter (also redder) than fourth ; mesothorax 

 red, with no yellow lines; scutellum bilobate, the lobes yellow; 

 metathorax blackened in middle, and laterally red, with an irregu- 

 lar (hook-shaped) yellow mark; legs red, hind femora and tibiae 

 more or less black behind ; wings strongly yellowish, stigma ferru- 

 ginous; b. 11. passing considerably basad of t. m. ; third s. m. high 

 and narrow. 



Nomada torrida Sm. 9 (T.). 



Basal nervure passing just basad of t. m. ; antennae with first 

 three joints red, the others dark, 3 and 4 about equal. 



Nomada fervida Sm. 9 (T.). 



Third antennal joint a little longer than fourth ; mesothorax with 

 very coarse large dense punctures ; anterior coxa? spined ; wings 



