t 



266 THE ENTOMOLOGIST. 



apical margin broadly smoky, nervures and stigma dark ferruginous ; 

 legs black with brownish grey pubescence, small joints of anterior and 

 middle tarsi dark ferruginous ; middle femora greatly swollen, with a 

 keel beneath, which is broadly notched in the middle ; middle tibiae 

 with a low keel beneath, which is curved at its end and terminates in 

 a pointed projection; basal joint of middle tarsi broad and flattened in 

 front ; hind femora swollen at the end ; hind tibia flattened into an 

 immense triangular body, which viewed from behind is broadly bifid 

 beneath ; hind tarsi with the basal joint slender, longer than the 

 others put together ; base of metathorax coarsely roughened ; abdomen 

 closely punctured, unicolorous, pruinose with short pubescence, which 

 on the hind margins of the segments forms pale bands ; third ventral 

 segment elevated at the lower lateral corners, and produced into a 

 spine, from which projects a tuft of hairs ; fourth ventral segment 

 with a sublateral nodule on each side. 



$ . Similar to the <? ; pubescence of mesothorax, scutelium, and 

 postscutellum extremely dense (except when worn), and ochreous in 

 colour ; legs not deformed as in the $ , pubescence on hind legs quite 

 fuscous, basal joint of hind tarsi broad, with dark ferruginous pube- 

 scence beneath ; antennas short, ordinary ; hair of ventral surface of 

 abdomen long and warm brown. 



Hab. Mesilla Park, New Mexico, Sept. 17th, in a sandy 

 place, $ ? {Ckll.) ; Aztec, N.M., at flowers of Verbesina enceli- 

 oides, Sept. 19th, ? (C. E. Mead). A larger insect than D. 

 apacha. The middle tibia has a spur in both sexes. 



Dieunomia mesillce, n. sp. 

 £ . Length about 15 mm. ; black, differing from D. xerophila as 

 follows : — Size smaller ; face covered with dense white hair ; vertex 

 closely punctured, except on each side of the ocelli ; apical joint of 

 flagellum not so broadened, its end truncate ; metathorax, except the 

 narrow basal enclosure, very hairy ; wings yellowish hyaline, apical 

 margins strongly smoky ; legs black, tarsi ferruginous ; middle femora 

 fairly swollen, concave, not keeled, beneath ; basal joint of middle 

 tarsus ending in a long, narrow, truncate projection; hind femora 

 greatly swollen, triangular in lateral view, the summit of the triangle 

 forming a thick conical eminence, the whole covered with erect grey 

 hair ; hind tibiae with a large, oblique, flattened, quadrangular process 

 of an orange fulvous colour; first three segments of abdomen strongly 

 depressed basally ; hair-bands of abdomen very distinct ; lateral in- 

 ferior corners of ventral segments simple. There is no spur on the 

 middle tibia, whereas D. xerophila has a single well-developed spur. 



Hab. Mesilla, N.M., July 5th, 1898 (C. M. Barber). This 

 insect is widely separated from D. xerophila by the shorter 

 antennae, much less dilated at the tip ; and also by the absence 

 of the spur on middle tibia, and general structure of the legs. 



Note. — Panurginus albitarsis subsp. fortior, Ckll., Entom. 

 May, 1899, p. 129, should stand as P. innuptus var. fortior. It 

 differs from the typical form in the maxillary palpi, but is hardly 

 separable as a race. 



Mesilla Park, New Mexico, U.S.A. : Sept. 26th, 1899. 



