324 HYMEN OPTEEA. 



v 25. SphaBrophthalma minutissima. 



Sphcerophthalma minutissima, Blake, Trans. Am. Ent. Sac. xiii. p. 253 \ , 

 Hal. Mexico (Sumichrast *). * 



/ ' 



26. Sphserophthalma psammadroma. 



Mutilla psammadroma, Blake, Trans. Am. Ent. Soc. iii. p. 254 \ 

 Sphcerophthalma psammadroma, Blake, op. cit. xiii. p. 253 2 . 



Hab. Mexico (Sumichrast x 2 ). 



/ 



27. Sphserophthalma ferruginea. 



Mutilla ferruginea, Smith, Descr. of New Species of Hymen, p. 226 (1879) l . 

 Spharophthalma ferruginea, Blake, Trans. Am. Ent. Soc. xiii. p. 249 2 . 



Hab. Mexico, Orizaba 12 . 



S. ferruginea probably belongs to this section, for the head is described as " wider 

 than the thorax, subquadrate, the hinder angles acute, the posterior margin nearly 

 straight." It is entirely ferruginous. The insect, however, may belong to Division B, 

 as the first segment of the abdomen is described as " small." 



The next four species have the keel behind the head not very distinct. They agree 

 closely in coloration, having the head and thorax entirely black (or with the pleurae 

 more or less testaceous), and coarsely clothed with silvery, or more often with golden, 

 pubescence ; the abdomen black, with two large, or two large and two small, orange 

 spots, the hinder segments fringed with silvery hair ; the head broader than long, not 

 bulging out much behind the eyes; the thorax narrowed behind, contracted in the 

 middle. 



The following synopsis will aid in their determination : — 



1 (2). The pubescence on the head and thorax silvery, the abdomen with only 



two orange spots . ........ . . amphissa. 



2 (1). The pubescence on the head and thorax bright golden; the abdomen with 



four orange spots. 



3 (4) . The pleurae entirely black orithyia. 



4 (3). The pleurae more or less testaceous. 



5 (6) . The pleurae entirely testaceous ; the thorax above covered entirely with 



golden pubescence ; a stout tooth before the middle of the thorax . . lycimnia. 



6 (5). The propleurae only testaceous ; the thorax at the sides only covered with 



golden pubescence ; no stout tooth before the middle of the thorax ; 



the head distinctly bulging out behind the eyes, behind concave . . . phedyma. 



