OF WASHINGTON. 319 



yellowish hairs and almost identical in form with those of y-inversus (Fig. 

 7, b, c}. 



Of this species I have seen but a single male, taken in 1884, 

 by Mr. Morrison, in Colorado. In general appearance, as well 

 as in the genital characters, it seems to be quite closely related to 

 P. y-inversus. 



Prodoxus sordidus, n. sp. IMAGO. $. Expanse, 8-10 mm. ; Q, 11-13 

 mm. General color, creamy-yellow, the females showing the most 

 white. A more or less distinct dusky or blackish posterior margin to the 

 secondaries, the dark color broadening toward the apex. The undersur- 

 faces have a tendency to metallic reflection and the darker color of the hind 

 border of the secondaries is repeated. Abdomen grayish-brown dorsally, 

 with iridescent reflection. Anal segment of 9 reddish-brown, obliquely 

 truncate from above, the tip rounded. Ovipositor yellowish-brown, 

 slender and finely denticulate along the upper edge. Male claspers similar 

 in shape to those of decipiens but more slender, the base comparatively 

 broader and the apex more abruptly rounded; the basal side piece nar 

 rower and pointed at tip ; the posterior edge with from 3 to 5 small slender 

 teeth. 



Described from 5 males and 5 females. 



I first found this species in the flowers of Yucca brevifolia on 

 the same occasion of the discovery of Pronuba synthetica, while 

 other specimens were subsequently obtained by Mr. Koebele. 

 In general appearance the species seems nearest related to P. 

 cinereus, being, how v^er, much paler, with the greater portion 

 of the hind wings w lite. 



COLEOPTEROUS LARVAE WITH SO-CALLED DORSAL PRO- 

 LEGS. 



BY C. V. RILEY. 



I have recently received from Mr. D. W. Coquillett, of Los 

 Angeles, California, the larva of Mordellistena pustulata^ which 

 he found in the dry stalks, apparently of the previous year's growth, 

 of Xanthium strumarium, and as they exhibit a peculiarity, viz., 

 the possession of dorsal fleshy processes having the appearance of 

 prolegs which belongs generally to the larva? of this genus, I have 

 thought it well to exhibit them to the Society, as also some other 

 Iarva3 which possess similar characteristics. Many of the members 

 will remember that at the 1890 (Indianapolis) meeting of the A. A. 

 A. S., at which I was not present, Prof. H. Osborn read a note 

 (published in the Canadian Entomologist, Vol. XXII, 1890, pp. 



