182 



MaxiUarn palpi (PI. VII., A. fig. 5, w^ short, robust, four-jointed ; 1 very small ; 2 



very large, ovate ; 3 small, very short, transverse ; 4 elongate, subconie, much 



brouder than the third, covered throughout with hair, and slightly incuiTed 



towards the ajiex. 

 Labial jialpi (PI. VII., A, fig. 6, m) large, robust, three-jointed; 1 very small ; 2 verv 



large, subcylindric, slightly incurved, at its e.xtremity abruptly truncate and 



armed on the margin with spurs, closed by a concave membrane, from the 



centre of which the minute acicular third joint arises. 

 Lahvum (PI. VII., A, fig. 3) rather large, semioval, constricted near the base. 

 Maiidihhs (PI. VII., A, fig. 1) strong, dilated towards the apex, strongly hooked 



and bifid at the extremity, furnished with a large corneous process at the base, 



ovally truncate in front, and deeply serrate ou the edges; from this process a 



straight membranous lamina extends to the apex of the mandible. 

 Ma.rilhe (PI. VII., A, fig. 5) small, unilobed, lobe rather large, sinuated and slightly 



incurved, armed at the apex with several long and very sharp curved teeth. 



Stipes small and produced ou the outer side. 

 Mcntiim (PI. VII., A, fig. 6, j) small, short, transverse, subquadrate, with the sides 



faintly rounded. 

 Lahiunt (PI. VII., A, fig. 6, k) small, oblong, terminated with very large, subconie 



pariiglf)s.sie. 

 Linriua (PI. VII., A, fig. 0, 1) large and broad, almost hidden by the palpi and 



paraglossffi. 

 I'rnnotum moderate, transverse, moderately excised iu front. 

 Svtitelium small, either triangular or rounded. 

 Khfira entire. 

 Witigs ample. 

 Abdomen composed of apparently seven segments, of which the apical alone is 



corneous, and the rest coriaceous. 

 Head on the under side with the mouth deflexed, and the gular portion large and 



convex. 

 T'rothora.r (PI. VII., A, fig. 2, a) with the prostrrnum small, elevated between the 



coxa; and slightly produced in front ; cpisterna minute ; epimera moderate, 



enclosing the coxal cavities ; coxal cavities suboval, not contingent. 

 Thorax with the mesosternum (PI. VII., A, fig. 2, d) short, deejily excavated iu front; 



episterna large ; cpimcra long and narrow, humeral, almost reaching the coxal 



cavities ; coxal cavities oval, somewhat distant. 

 metastcnium (PI. VII., A, fig. 2, g) large, not extending to the sides of the body, 



with the posterior margin between the coxje straight ; cpisterna very large and 



broad, reaching to the coxfe ; cpintera long and narrow, concealed b\' the elytra 



except the apex, which is inflexed and rounded. 

 Venter composed of six segments ; 1 large and long; 2-5 much shorter, equal to 



each other ; 6 twice louger than the fifth, entire. 

 Legs anterior with the coxie long and ovate; trochanters small, ovate; femora 



simple ; tibire often very long and much incurved, abruptly incurved at the 



apex with the extremity obtuse ; tarsi rather long, four-jointed, 1 and 2 nearly 



equal, much produced on the lower side, 3 very small, 4 long and slender, 



claws long, slightly curved, and incrassale at the base. 

 ititennediaic with the coxse oval, rather distant, tibiae simple, not elongate, in other 



respects like the anterior. 

 posterior with the coxi^ large, suboval, widely distant, iu other respects like the 



intermediate. 



This genus is distinguished from RItypobivs by the much more evident extrusion 

 of its head, its nine-jointed antenuie, and in many species by its very long incurved 

 anterior tibiae. The species of Ortliopems appear to be numerous, and common to 

 both hemispheres ; but in a state of nature are dillicult to detect, owing to the close 



