134 ENTOMOLOGICAL NEWS. [April, '07 



bristles in two rows, very small, except the posterior two of each row, 

 with slight dots from which the separate bristles arise ; along each 

 side of the dorsum a darker pollinose stripe above the pleural suture; 

 before the scutellum a median darker stripe, continuing the two fine 

 median lines to the scutellum (the insertion of the pin prevents my 

 describing this more closely) ; scutellum more bright coppery red, 

 with two bristles ; pleura uniformly and densely pollinose with grey, 

 the coppery ground color but little visible. Halteres yellow. 



Abdomen less pollinose and more coppery than the thorax, of four 

 well-developed segments, the others modified ; fourth segment one- 

 third as long as the preceding one; the "anal appendages" arise on 

 the dorsal side, between the fourth and fifth segments — they are a 

 pair of delicate organs, black at base, whitish beyond, each ending in a 

 spoon-shaped, orange-colored enlargement, which bears a dense series 

 of small, dark hairs along the outer side and a tuft of similar ones 

 on the inner apical angle; third abdominal segment protuberant below, 

 the grasping organs of the hypopygium projecting behind it. 



Legs blackish-green, somewhat pollinose, of complicated structure. 

 Fore femora with the usual spines beneath ; fore tibije with a row 

 of stiff hairs on the inner side beyond the middle and a stout thumb- 

 like curved claw on the anterior side before the end ; also, with a 

 striking lobe or lappet on the inner side of the tip. Middle femora 

 slender, a little arcuated ; middle tibiae with a row of erect bristles on 

 the anterior side past the middle, and curled long hairs on the posterior 

 side at the tip. Hind femora, tibiae and tarsi of plain structure, the 

 tibiae without noticeable bristles at the tip. 



Wings brownish-yellow on the basal half, more brown apically; a 

 large brown spot on the posterior crossv6in and another on the 

 arcuation of the fourth vein, before and beyond the latter vein is 

 widely bordered with yellow. Length, including appendages, 7 mm. ; 

 of wing, the same. 



Female. Antennce much shorter, the third joint only a little longer 

 than the other two, arista apical, a little longer than in the male. 

 Abdomen of five equal segments. Legs destitute of striking modifi- 

 cations, however, the spines under the fore femora are as large as in 

 the male. Wings as in the male. Length, 7.2 mm. 



The type is a male, collected by myself, October 11, 1905, 

 in the salt marshes nearest to Palo Alto, Cal. It was stalking 

 over the grotmd in a bare spot, and looked more to me like a 

 Tipnlid than anything else. 



I have also a male and a female cotypes, collected in the 

 same vicinity by R. W. Doane, on October 11, 1906. He 

 studied the courtship of the species at that time. (Vide posted, 

 page 136). 



