138 Psyche [October 



pair lateral to these (four in all) ; the bristles of the marginal row 

 are more slender and may also be lacking. Both rows were not 

 absent in any specimen examined by the writer. The connection 

 membrane between the genital segments has less play than in 

 most species of Sarcophaga and is scarcely discernible. The ac- 

 cessory plates somewhat resemble these of the tsetse flies as regards 

 their apparent position. Due to the fact that the ventral edges 

 of the third and fourth abdominal nota overlap the third and 

 fourth central plates these are not plainly visible as in the genus 

 Sarcophaga. 



The writer is indebted to the United States National Museum, 

 to Mr. A. F. Burgess of the Gypsy Moth Laboratory at Melrose 

 Highlands, Mass., to Prof. H. T. Fernald of the Massachusetts 

 Agricultural College at Amherst, and to Mr. H. E. Smith of the 

 Bureau of Entomology Laboratory at West Springfield, Mass., 

 for the loan of material. 



• Explanation of Figure 1. Sarcofahrtia ravinia sp. nov. 



Fig. 1. Showing character of ventral plates, of sixth ventral plate 

 (sternum) and position of spiracles; the sixth ventral 

 plate pulled out of normal position. 



Fig. 2. End of abdomen with hypopydium removed and showing 

 normal position of sixth ventral plate (membrane folded 

 back and sixth plate lies above fourth taxonomic 

 plate) . 



Fig. 3. Profile view of end of abdomen with genital segments in 

 their normal position. Note line of fusion of sixth 

 and seventh abdominal nota and the two rows of 

 bristles. 



Fig. 4. Posterior surface of middle tibia of male showing one 

 bristle. 



Fig. 5. Posterior surface of middle tibia of female showing two 

 bristles in addition to the one found in the male. 



Fig. 6. Profile view of second genital segment, forceps, penis and 

 claspers. 



Fig. 7. Posterior view of forceps. Note base without upward flap- 

 like extensions and the spread forceps prongs (Ravinia 

 like). 



