150 THOMAS SAY FOUNDATION 



No. 69. Sarcophaga rufiventris Wied. 



Wiedemann, Auss. Zweifl. ii, 362, 1830. — Brazil. 

 Brauer und von Bergenstamm, Zweifl. Kais. Mus., v, 414, 

 1 89 1, oc. in Texas. 



A slender species, somewhat below medium size, 

 instantly distinguished from all others by the abdo- 

 men being a bright red except at the base, and not 

 very strongly pollinose. 



Male. Front .257 of head; parafacials and para- 

 frontals silvery; parafrontals, however, subshining 

 above; parafacials with a few hairs near the eve; 

 about 8 frontal bristles, descending only to the base 

 of the antenucE, moderately divergent below; the an- 

 tennae brownish red; third joint less than twice the 

 second, reaching three-fourths of the way to the vibris- 

 sae, which are at the oral margin. Bucca over one- 

 fourth the eyeheight, bare and somewhat silvery in 

 front ; palpi black ; proboscis small ; back of head with 

 two rows of black hairs and considerable pale beard; 

 outer vertical bristle present, the inner one very large. 



Thorax densely gray pollinose, the usual stripes 

 not very distinct ; ps dc 3 ; ant acr rather small but dis- 

 tinct; prsc smallish; stpl 3; the scutellum with two 

 marginals, subapicals almost imperceptible, 1 pair 

 smallish apicals, not convergent. 



Abdomen as described; first and second seg- 

 ments with one lateral bristle; third segment with an 

 interrupted row; fourth with a row of 14. 



Hypopygium yellowish red, of medium size, 

 lightly pollinose; first segment apparently without 

 bristles; second segment with some rather coarse 

 black hairs. Forceps nearly straight, hardly diverg- 

 ing at all, in profile about equally slender from base 

 to apex and not provided with any hook or tooth ; ac- 

 cessory plate small, narrowing into a slender point; 

 posterior clasper brown and slender, nearly straight, 

 not hooked at apex, bearing on the front side a very 

 long hair, beyond which it is considerably narrowed; 

 anterior clasper stout, strongly cur^ ed, with a thin 

 edge, but not hooked; penis small, ratlier difficult to 



