8o Myron Harmon Sivenk 



Nomada (Holonomada) superba malvastri n. subsp. 



1903. Nomada superba var. a Cockerell, Proc. Acad. Nat. Sci. Phil., 

 p. 580, c?. 



1905. Nomada superba Cockerell, Bull. 94, Colorado Exp. Sta., p. 73, 

 J" (in part), 

 c?. Length 10 mm. Similar to typical A'', superba 3, except in the fol- 

 lowing details : Posterior orbits, except top, with a yellow line (lacking 

 in typical superba) ; whole of face beneath level of insertion of antennae 

 yellow (considerable black beneath level of insertion of antennae medially 

 in superba) ; yellow lateral face marks extending upward rather broadly 

 and sending a narrow line up to summit of orbits (falling considerably 

 short of summit of orbits in typical superba^ ; a large triangular yellow 

 pleural spot below tubercles (small or wanting in most specimens of 

 superba) ; whole of mesoscutellum and a line on metanotum yellow (meso- 

 scutellum merely with two yellow spots, metanotum black, in typical 

 superba); trochanters, femora and most of tibiae red, the tarsi, and apices 

 with more or less of anterior faces of first four tibiae, yellow (in superba 

 the trochanters are black, the femora mostly red, the tarsi and the tibiae, 

 except a red spot on posterior face, are yellow) ; yellow band on first 

 abdominal tergite broader and margined behind with red instead of black, 

 that on tergite 2 very broad and scarcely at all indented or narrowed 

 medially (much so in superba) ; venter largely red, banded with yellow 

 (ground color of venter mostly black in typical superba) ; wings clearer 

 and lacking much of the apical darkening of typical superba, the nervures 

 much paler. 



Type. — Warbonnet canyon, Sioux county, Nebraska, June 16, 

 1901, on Mah'astrum coccineum (M. Gary), J*. 



Aside from A'^. superba, this distinct form needs no comparison 

 with other males of Noniada belonging to this subgenus (Holono- 

 mada), since its large size, angled and unspotted propodeum, 

 yellow tegulae, strongly bilobate mesoscutellum, etc., will serve to 

 distinguish it from any other of our North American species. 

 This form is the same as that described by Cockerell as var. a, 

 from a single male collected at Cheyenne, Wyoming, which is only 

 a short distance west of the type locality of malvastri, on June 

 15, and now in the U. S. National Museum collection. 



Nomada (Holonomada) nebrascensis n. sp. (or superba var. ?). 



$. Length 10.5 mm. Head and thorax red, without any yellow any- 

 where. A large area beginning at level of insertion of antennae and 

 extending upward as a gradually widening patch over upper face and 

 vertex and involving all of vertex and cheeks except the broad red orbital 



80 



