226 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Key to the Species of Dichogaster. 



I. Two pairs of spermathecae. 



1. One pair of prostates in XVII. Somite I reduced. Penial setce 



present D. Crawi, sp. nov. 



2. One pair of prostates in XII. Somite I normal. Penial setae 



present D. saliens Beddard. 



3. Two pairs of prostates in XVII and XIX. No penial setae. Male 



pores in the intersegmental groove, but in XVII. 



D. Ribaucoiirti, sp. nov. 



4. Three pairs of prostates in XVII, XVIII and XIX. No penial 



setae. Male pore in the equator of XVII. 



D. Townsendi, sp. nov. 



II. One pair of spermathecae. No penial setae. 



5. Three pairs of prostates in XVII, XVIII and XIX. A wart-like 



spermathecal diverticle. Spermathecal pores VII/VIII. 



D. Damonis Beddard. 



6. One pair of prostates in XVII. Male pores open in a copulatory 



bursa. Spermathecal pores VIII/IX. No spermathecal diver, 

 tide D. nigra Beddard. 



7. One pair of prostates in XVII. Male pores separated. Sperm- 



athecal pores VIII/IX. A wart-like spermathecal diverticle. 



D. mimus Michaelsen (io). 



III. One pair of spermathecae. Penial setae present; one pair of prostates 



in XVII. 



8. Differentiated spermathecal sexual setae. 



D. Hupferi Michaelsen (6). 



9. No differentiated spermathecal sexual setae. 



D. Bratmsi Michaelsen (18). 



