FALL AND COCKERELL. 259 



Head qii:i(lr;ite, feebly shiniup, rather coarsely and closely punctate, median line 

 impressed, more deeply so behind. Prothorax subqnadrate, sides parallel, punc- 

 tuation equally close and nearly as coarse as that of the head. Elytra dull, finely 

 punctate. Front tibise with two spurs in both sexes. Length 10-13 mm. 



Three examples are before nie, all collected by Townsend on the 

 North Fork of the Ruidoso, White Mountains, 7200 feet. 



By Horn's table this species would stand with caviceps because of 

 its antennal structure. 



RHIPIPHORID^. 



,Myo«liles vierecki n. sp. — FemaZe.— Black, prothorax with sides and 

 middle of base yellow, or almost entirely black, with but slight trace of yellow 

 at sides; elytra yellow; abdomen yellow, first four or five dorsal segments each 

 with a large transverse black spot, the whole forming a broad stripe; terminal 

 dorsal with small subapical spot and the side margins near the apex black ; ven- 

 tral segments marked transversely with black in varying degree; legs entirely 

 yellow. Head closely but not very coarsely punctate, vertex obtuse. Antennal 

 rami unusually long, notably decreasing in length from base to apex. Prothorax 

 finely, moderately closely punctate basally, broadly smooth at sides and in front ; 

 elytra indistinctly punctate, abdomen very finely so. First joint of hind tarsus 

 about twice as long as wide, much wider than the following joint and twice as 

 long. Length 8-11 mm. 



Alainogorda (Viereck) ; Florence, Arizona (Skinner). 



Of this species females only have been seen. By Le Conte's table 

 (Trans. Am. Ent. Soc, 1880, p. 210) popenoi, semiflavus and seaber 

 are said to have the abdomen in the female yellow, while in all the 

 remaining species it is black in both sexes. In this respect the 

 present species occupies an intermediate position, the prevailing color 

 being yellow, but with about as much black as yellow in some speci- 

 mens. From popenoi, vierecki may be further separated by the much 

 less stout basal joint of the hind tarsus, while the smooth thorax and 

 less densely punctured head will separate it from seaber. I have 

 compared with type of semijiavus (described from Maryland) and 

 found them quite distinct, but neglected to make note of differences. 



Solidaginis Pierce agrees well in size, in tarsal formation and 

 general aspect, but differs by the black legs and uniforndy punc- 

 tured thorax. In both solidaginis and seaber the antennal pectina- 

 tions are of nearly uniform length from base to apex, and very much 

 shorter than in vierecki, in which the basal ramus is fully twice as 

 long as the apical and about three-fourths as long as the widtii of 

 the front between the eyes. This character will I believe separate 

 the present species from many, and perhaps all of our previously 

 described forms. 



TKANS. AM. ENT. SOC. XXXIII. JULY. 1907. 



