June-Sept., 19 19. ] TlMBERLAKE : HlPPODAMIA. 167 



to suppose that mating between parenthesis and lunatomacidata 

 apicalis never takes place in nature. Such unions, however, are 

 probably relatively rare, and in the case of any one female its results 

 might well be nullified by the prepotency of the much more frequent 

 intraspecific matings. 



The writer has also examined the genitalia of a third species be- 

 longing to this group from Mineral King, Tulare County, California, 

 in the collection of Dr. E. C. Van Dyke, but the specimen is not at 

 hand for description. It is a heavily vittate form intermediate be- 

 tween typical apicalis and lengi Johnson, and may prove to be the 

 latter species. Much more material in this group is needed, how- 

 ever, from the mountains of California and other parts of the West 

 before our knowledge of lengi and its variations is complete. 



Convergens Group. 



The species allied to convergens, so far as their genitalia have 

 been studied, may be separated as follows : 



1. Posterior lobe of theca without a small, acute tooth, on each side near apex. 2 

 Posterior lobe of theca with a small, acute tooth on each side near apex, 



beyond which it slopes downward and backward to an acute, slightly- 

 produced point, and is somewhat longitudinally furrowed on its dorsal 

 surface, the concavity being most pronounced between the subapical 

 teeth 4- sinuata Mulsant. 



2. Posterior lobe of theca without a transverse carina 4 



Posterior lobe of theca with a trnnsverse carina a little beyond the 



middle 3 



3. Posterior lobe narrow, triangularly tapering from base to apex; its dorsal 



surface in front of carina slightly concave, the surface beyond the 

 carina sloping downward and produced into a rather long, slender 

 process as seen from above, but in side view continuous with tfcc 

 strongly compressed cancave sides of the under surface. 



5. 15-maculata Mulsant. 

 Posterior lobe rather short and wide, its lateral margins as seen from above 

 slightly convex to near the apex, then abruptly narrowed and produced 

 into a short, acute point ; its dorsal surface in front of the carina 

 somewhat concave, but beyond the carina sloping downward to the 

 apex ; the under surface somewhat compressed especially towards the 

 apex 6. cockerelli Johnson. 



4. Posterior lobe of theca comparatively large or about as long as the basal 



part 5 



