450 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 59. 



both of these genera the scutellum is angled so that it presents a 

 dorsal and a nearly vertical or backward-looking surface, both 

 deeply hollowed out. The cup is situated at the angle where these 

 two slopes meet and it itself arched so that the posterior part bearing 

 the usual pit faces backward. Just in front of this depression is the 

 spine, which projects back horizontally. The spine is thus produced 

 on the dorsal surface of the cup and does not involve the disk, which 



is rounded behind or 

 truncate. In Acantheu- 

 coela the carinae on pro- 

 podeum are parallel 

 anteriorly, suddenly di- 

 verging about middle to 

 twice former distance 

 apart and then gradually 

 converging to former 

 distance apart at pos- 

 terior margin. In Gon- 

 ieucoela the ridges are 

 said to approach in front 

 of middle and diverge 

 toward either end. In 

 Acaniheucoela the pits of 

 scutellum are normal, 

 rounded, not reaching 

 over halfway to base of 

 spine on cup, and the 

 disk behind the cup bears 

 three ridges to posterior 

 margin. In Gonieucoela, 

 the pits are quadrangu- 

 lar, reaching whole 

 length of dorsal slope of 

 scutellum, that is to base of spine and behind the cup there are two 

 carinae diverging to hind margin. 



Genus DICERATASPIS Ashmead. 



Genotype. — Dicerataspis grenadensis Ashmead. 



The genus Dicerataspis was founded by Ashmead on a unique 

 female, described in 1896 8 , which was said to have the abdomen 

 bare at the base. Later 9 he described the male from two specimens, 

 one of which is in the United States National Museum. It has a 

 distinct hairy ring at base of the second tergite. Through the kind- 



Fig. 9.— Details of acantheucoela aemata (Cresson). 



Proc. Zool. Soc. London (1895) p. 744. 



» Trans. Ent. Soc. London (.1900) p. 246. 



