OETHEZIA TJRTIOE. 231 



rounded on their anterior margin, directed backwards, 

 project laterally in regular succession, to a considerable 

 extent, each lamina (on the sides) (six to seven) show- 

 ing a little beyond the one immediately preceding it ; 

 the posterior ones (three on each side) being greatly 

 elongated, sometimes curved, and lying in the side 

 grooves of the marsupium, but not above half their 

 length, and the terminal middle one, arising just at the 

 anal orifice, either lying depressed in the middle groove 

 of the marsupium or elevated at an acute angle. I 

 am not sure if this elevation be a voluntary act on the 

 part of the insect, nor if the lamina ever assumes the 

 procumbent position ; often it is broken off, for all the 

 laminae are removable with the slightest touch. The 

 marsupium, consisting of cereous matter of a thin 

 shell-like structure, formed (apparently) in two plates, 

 at any rate easily separable into two, is attached at the 

 base to the abdomen, but extends far beyond it ; the 

 lower plate convex, the upper one flattened, the space 

 between them forming a large cavity. . . . The lower 

 plate arises immediately behind the posterior coxae, and 

 is perfectly smooth ; the upper plate, constituting half 

 the apparent length of the insect, has its surface deeply 

 channelled lengthwise, the middle channel wide and 

 rounded out, the others (three on each side of it) 

 narrow, the intervening divisions thin, simulating 

 laminae, as I previously termed them " (Douglas, 

 'Trans. Ent. Soc. Lond.,' 1. c.). Antennae (fig. 2) 

 sparsely spinose, normally of eight joints; formula 

 variable, usually 8 (2, 3), 1, 4 (5, 6, 7), or 8, 3 (2, 1) 

 (4, 5) (6, 7) ; abnormal antennae of six (fig. 2 a) or 

 seven joints are not infrequent; apical spine of the 

 last joint of the antennae short, stout, and rather 

 bluntly pointed. Eyes (fig. 7) comparatively small, 

 tuberculate, and slightly recurved. Legs nearly as 

 long again as the antennae, strongly spinose ; coxa 

 very broad ; trochanter very narrow ; femur and tibia 

 of equal length ; tarsus two thirds the length of the 

 tibia ; claw rather long, acute. Ventral spiracles 



