RILEY SARRACEXIA INSECTS. 239 



branches (6 being usually apparent, never more than 8), which in their 

 turn ramify into lobules. Anal stigmatic cavity quite deep; the fleshy 

 prominences on the carina surrounding it, sub-obsolete; the stigmata 

 but slightly excavated below, the border brown, enclosing three brown 

 openings, the lower ends of which reach to a circular clear space in the 

 corneous and pale rufous peritreme. Anal prolegs quite small, with the 

 longitudinal anal slit between, and a corneous plate in front of them. 



Pufiarium — 0.25-050 inch long; neither smooth nor highly polished, 

 and varying from j^ellowish-brovvn to deep brown-black in color. Insec- 

 tions more or less distinctly traceable. Head and prothoracic joint re- 

 tracted ; the prothoracic spiracles, protruding and forming two small ears, 

 about as long as joint 2 ; the mass of lobules hardened and rufous. Joints 

 2 and 3 constricted and flattened; 4 suddenly bulging. End of body 

 squarely docked by spiracular cavity, the rim of which forms quite a ridge. 



Imago — Length of body 0.23-0.56 inch. Head pale golden-yellow, 

 especially when viewed from above, with a dark brown or bronze sheen, 

 especially below: eyes ferruginous, in life; duller and bronze-colored in 

 death : stripe between the eyes and all appendages jet-black, though show- 

 ing, in fresh specimens, shades of brown or yellowish-brown, especially at 

 inner base of antennae and on maxipalps. Thorax pale ash-gray, with 

 three prominent, dark, longitudinal, dorsal vittse, and two which are short- 

 er, on each side; the two intervening pale dorsal spaces showing also 

 a narrow darker line along their middle : wings slightly fuliginous; teguhe 

 sordid white : legs black, with the front thighs grayish beneath ; cushions 

 large and pale yellowish. Abdomen of the same gray — inclining, in some 

 specimens, to pale golden-yellow, especially behind — checkered with black, 

 the pattern varying with each change of light, but 3 longitudinal lines 

 tolerably distinct from above, the side ones approaching or joining the me- 

 dial one on the anterior part of each joint, and the whole looking check- 

 ered as the light falls on the sides : anus always, and frequently the hind 

 margin of preceding or 4th abdominal joint, pale reddish-brown, the color 

 deepening and becoming less noticeable in the dead specimen; the globu- 

 lar and highly polished S genital organ of a brighter and deeper reddish- 

 brown. 



Described from numerous specimens reared from Sarrace?ua variola- 

 ris and 5. flava. 



Remarks. — Though there is such great variation in size — depending, 

 no doubt, on the amount of nourishment obtainable by the larva — there is 

 not much in coloration. The species agrees tolerably well with the de- 

 scriptions of carnaria except in having a red anus, and should perhaps 

 be considered only a variety of this last. Whether it be any of Walker's 

 or Desvoidy's species mentioned in Osten Sacken's catalogue, I have no 

 means of positively knowing, but I have carefully read over the descrip- 

 tions of Meigen, Macquart and Wiedemann without feeling warranted in 

 referring it to any of them. Several of the brief descriptions of these 

 authors might answer for it, barring the red anus ; for a number of them 



