SARCOPHAGA AND ALIJES 117 



31. Anterior acrostichals strong, three pairs (Brit- 

 ish Guiana) No. 73. hospes n. sp. 

 Anterior acrostichals hardly differentiated from 

 hairs (widespread) 



No. 74. helicis Towns. 



No. 47. Sarcophaga magna n. sp. 



Male. Front almost exactly one-fifth of the 

 head width (in the five specimens, .182, .200, .203, 

 .204, .204, average .1986) ; parafrontals and para- 

 facials subsihery, the former with numerous small 

 hairs up to the level of the lowest ocellus; the latter 

 with numerous rather coarse hairs not evidently ar- 

 ranged in rows, which continue on the facial impres- 

 sion; frontals strongly diverging below, reaching as 

 far as the middle of the second antennal joint; frontal 

 stripe brown, twice as wide above as one side; vibrissa? 

 about two-thirds the length of the second antennal 

 joint above the oral margin; facialia hairy half way or 

 more to base of antenm^"; antennae brown, third joint 

 reddish, rather slender, twice the second, reaching 

 three-fourths of the way to the vibrissa?; arista plu- 

 mose only a little over half way; palpi dark yellow, 

 hairy, the base brown; proboscis short; back of head 

 with three very distinct rows of black hairs, and all 

 round the neck abundant pale ones, which, however, 

 are mostly replaced by black below; lateral vertical 

 not differentiated. 



Thorax gray pollinose with 3-5 black stripes; 3 

 ps dc; 2 ant dc; 3 stpl; ant acr well developed; pre- 

 scutellars one pair of good size; scutellum with two 

 large lateral pairs (between them one or two smaller) , 

 one subapical and one apical of fairly large size. 



Abdomen gray pollinose with the usual tessella- 

 tions, the fourth segment rather broadly red at apex ; 

 first and second segments with only lateral bristles, 

 third with a pair of erect median marginals and four 

 lateral, fourth with row of about 18. 



Hypopygium entirely red, first segment with 

 row of about six stout bristles near tip; second seg- 



