44 Mr. G. C. Champion's Revision of the Mexican 



the dorsal portion of the same segment truncate on each side of the 

 median fissure (fig. 10, profile view); ninth segment subtrilobate 

 at the tip, the pairs of long spines or hooks appearing longer or 

 shorter according to the extent of evagination of the internal sac 

 (fig. lOo.) 



Length (excl. head) 8^11, breadth 2i-4i ram. {^ ?.) 



Hab. Mexico, Durango, Vera Cruz, Morelos, Guerrero, 

 Oaxaca ; Guatemala, San Geronimo : Costa Rica. 



The numerous examples received from Durango and 

 Guerrero connect the various forms of this insect. Speci- 

 mens of it were found in the " Biologia " collection under 

 D. erosum, plicatum, normale, and duhium. From D. 

 normale and D. duhium the present species may be separated 

 by the form of the tarsal claws of the male, and the abruptly 

 sinuato-emarginate sides of the prothorax in the female ; 

 from D. jMcatum by the broader prothorax, and the 

 different position and shape of the lateral incision, as well 

 as by the smaller eyes, in the male ; and from D. erosum 

 by the more dilated prothorax, with less upturned margins, 

 the differently formed ^ tarsal claws, etc. D. inconstans, 

 too, is extremely like D. photinoides, Gorh., an insect 

 occurring at the same locality in Guatemala (San Gero- 

 nimo), but differs from that species in its larger size and 

 more elongate shape, and in having the tarsal claws of the 

 male otherwise formed. Eleven males have been dis- 

 sected, the internal sac of the aedeagus being partly or 

 wholly evaginated in some of them. 



33. Discodon biolleyi, n. sp. 



Elongate, shining, testaceous, clotlied with long pvibescence, 

 which is especially conspicuous on the prothorax; testaceous, the 

 eyes, palpi, antennae (the base excejated), apices of the femora, 

 tibiae in part, and tarsi infuscate or black. Eyes very large and 

 prominent in (J, a little smaller in $. Antennae very long and 

 slender. Prothorax broader than long, arcuate in front, transversely 

 excavate on each side anteriorly, and depressed and carinate down 

 the middle towards the base; obliquely notched on each side just 

 behind the middle, and with the basal portion narrowed and parallel- 

 sided, in ^ ; broader and with the margins trisinuate in $. Elytra 

 long, wider than the prothorax, subparallel, the sculpture rather 

 coarse. Inner claw of anterior tarsi broadly lobed, and outer claw 

 of the other tarsi cleft at tip, in (^. 



