l'.)()3.] NATURAL SCIENCES OF PHILADELPHIA. 605 



Nomada lehighensis, sp. n. 



$. — Length about TV mm.; ferruoinous; area just above antennse, 

 region of ocelli, cheeks behind, anterior margin of mesothorax and three 

 longitudinal bands (the lateral ones more or less evanescent), band 

 on metathorax and broad band from wings to middle coxse, all black ; 

 first segment of abdomen with lateral wedge-shaped blackish marks, 

 but not black across the middle ; second and third segments with dis- 

 tinct but small and round lateral j'ellow spots; fourth with sometimes 

 four ^'ery small and indistinct yellow spots; fifth without yellow; \-en- 

 ter ferruginous, darker in the middle, but immaculate. jMandibles 

 simple; lower corners of face with a small yellow spot, not always 

 evident; head broad, facial quadrangle a little broader than long; an- 

 tennce entirely ferruginous; fourth joint distinctly l)ut not greatly 

 longer than third, and a very little shorter than twelfth; tegulre fer- 

 ruginous, punctured; legs red, the basal parts suffused with blackish; 

 wings rather dusky, especially on apical margin; stigma very dark fer- 

 ruginous, nervures fuscous ; second submarginal cell with its lower inner 

 angle produced; basal nervure a short distance basacl of transverso- 

 medial; pygidial plate with gently rounded sides, the apex subacute. 



c?. — Similar to that of A^. sayi, Rob.; but face broader; the slender 

 scape ferruginous in front ; third antennal joint nearly as long as fourth, 

 ^^hich is shorter than in sayi; basal nervure very near to transverso- 

 medial (far basad of it in sayi) ; abdomen darker, with the yellow spots 

 not pointed mesad ; whole insect less slender. 



Hab.— Lehigh Gap, Pa., July 1, 1S97, 9 ; July 11, 1900, 9 ; July 21, 

 1902, Q ; June 29, 1901, 9 ; June 25, 1901, 9 , d ; June 30, 1901, d. 

 Collected by Mr. Viereck. In one female the abdomen is without 

 yellow spots; in another there is only one black band on the meso- 

 thorax. 



A', lehighensis is a good deal like the Californian N. atrofrontata, 

 Ckll., but among other differences the mesothorax of the latter is 

 much more finely pimctured. From the Oregonian A', ultima, Ckll., 

 N. lehighensis is easily separated by its yellowish-red abdomen, with 

 none of the coppery luster of ultima. 



Nomada sayi, Rob. 



I have an Illinois male from Mr. Robertson. ^Ir. "S'iereck has taken 

 the species as follows: Clementon, X. J., June 2, 1901, 9 ; Edge Hill, 

 Pa., females. May 20, 1900, April 28 and May. 5. 1901 ; Philadelphia, 

 Pa., June 22. 1899, 9 : Ashbourne, Pa., May 24. 1901, three males (all 

 with scutellum red) and one female. It appears from these dates that 

 .V. sayi flies earlier than N . lehighensis. 



