58 CLARK — THIUTY-TIIREE NEW SPHINGIDAE [ P V ul'. vm' 



I never have seen the type of P. neavi, but possess that of P. 

 martha Closs, and I feel confident that the latter is distinct from 

 P. calcareus, and that in all probability P. neavi and P. martha 

 are the same species. The fuscous median band in the type of 

 P. martha is entirely lacking in the three specimens in my col- 

 lection of P. calcareus from Rhodesia. In addition, the thorax 

 of each one of the three specimens of P. calcareus is unicolorous, 

 while in the type of P. martha the mesothoracic tegulae are 

 much darker than the median portion of the thorax, making a 

 strong contrast. This same contrast is brought out in the 

 colored drawing of P. neavi in P. Z. S. (1910), Plate XXXIX, 

 no. 26. 



OBERTHURION gen. nov. 



This new genus is closely allied to Pachylia. Spines of distal 

 tergites uniseriate, all long, very heavy. Eye large, not lashed. 

 Antennae strongly clubbed, hook long and thick; end segment 

 rather blunt. Distal margin of both fore and hind wings undu- 

 late between the veins, strongly so in the fore wing, less so in 

 the hind wing. Costal margin curves strongly back toward 

 wing apex, producing a wing of unusual form, with a breadth 

 almost equal to the exterior margin. It is a privilege, as well 

 as most fitting, to name this remarkable new genus, the first 

 one discovered in the Sphingidae of the Western Hemisphere 

 for more than twenty years, for my dear friend Mr. Charles 

 Oberthur, who stands today preeminent among the entomol- 

 ogists of the world. 



Oberthurion harroverii sp. nov. 



Al. ant. long., cf, 47 mm. Al. ant. lat., d\ 23 mm. Marg. ext., d\ 

 25 mm. 



Habitat. — Valley of the Chirripo River, Costa Rica, 1500 ft. altitude. 

 Taken on the trail in dense vegetation by Mr. David E. Harrower, July 21, 



