T. D. A. COCKERELL. 191 



wings, etc. The name is intended to recall Dr. Hermann Miiller, 

 and his admirable researches on the relations between bees and 

 flowers. 



(16). Halictoides inaiiruN (Cress.). 



Panurgus maiirus Cr., Tr. Am. Ent. Soc, vii, p. 01, 9 • — Colorado. 



I have an authentic specimen sent by Mr. Fox. The species is 

 allied to H. campanulis Ckll., but differs by the color of the pubes- 

 cence. Apical angle of third discoidal cell a right angle ; venter 

 of abdomen with a subapical projection and tuft of hair ; head 

 transversely oval, with small eyes ; facial quadrangle much broader 

 than long ; clypeus densely punctured. 



(17.) Halictoides virgatii^i u. sp. J.— Length about 9 mm., black. 

 Allied in structure and appearance to H. muJleri, but differs in its larger size, the 

 head black, without a blue tinge, head not broader than long; semilunar base of 

 metathorax distinctly defined, with distinct but very fine raised longitudinal 

 lines; abdomen with the hair-bands rather better developed; apex of abdomen 

 surrounded with pale fulvous hair. 



%. Length 10 mm., black, hoary, with white pubescence; some black hair at 

 top of scape, at sides of face below antennse, on upper part of cheeks, on extreme 

 sides of vertex and on front below ocelli, nowhere very conspicuous ; head nearly 

 round, seen from in front; the vertex somewhat elongated; occiput with a con- 

 spicuous fringe of hair; scape with long hair; clypeus with a dense white beard ; 

 front and vertex, strongly and closely punctured ; palpi tolerably elongated ; 

 anteunpe moderately long, black, submonilifoi-m, first four flagellar joints about 

 equal ; thorax tolerably hairy, the hairs sordid white ; mesothorax shining, 

 strongly and closely punctured ; base of metathorax depres.sed, with numerous, 

 very fine, raised, longitudinal lines: tegulse brown ; wings dull hyaline ; nervures 

 and stigma brown ; venation as in halictulus ( % marginatns), except that the sec- 

 ond submarginal cell is more narrowed above; cubital nervure bent; legs black 

 or dark brown ; hind tibise swollen, with much silvery white hair; on the inner 

 side of the hind tibiae near the base is a very long curved tuft of white hair; mid- 

 dle femur produced beneath into a prominent lamina shaped like the keel of a 

 racing yacht; basal joint of middle tarsus with a large semilunar lamina on the 

 inner side ; basal joint of hind tarsus long, produced at end into a sharp beak-like 

 process, second and third joints of hind tarsus small, with a long lateral process; 

 abdomen well punctured ; hind margins of segments whitish; white hair-bands 

 at margins of segments distinct (sometimes largely abraded) ; apex with silvery 

 hair; first ventral segment submarginate at tip ; fourth ventral segment with a 

 projecting point at each extreme side po.steriorly ; a subapical tuft of white hair, 

 before which is a longitudinal ochreous band. 



Hub. — Southern California, 4 9 , 8 t , sent by Mr. Fox. The 

 % is easily known by the extraordinary legs, as described. In 

 the S of the allied H. saundersi the legs are slightly modified in 

 the same direction, the front and middle femora being keeled 



TRANS. AM. ENT. .SOC. XXV. DECEMBER. 1898. 



