166 COLOMBIAN DERMAPTERA AND ORTHOPTERA 



the limbs. The form is robust, but not as stout as in that insect. 

 There are no lobes or spines, except that the sixth dorsal abdom- 

 inal segment has the median carinulae terminating caudad in a 

 very small sub-lobate projection. Westwood's figure is excellent, 

 showing accurately the arcuation and greater distinctness of the 

 medio-lateral carinulae on the dorsal surface of the abdomen. 



Libethra insalubris^^ new species (Plate XXIII, fig. 3.) 



Apparently closely related to L. rahdotula Brunner, differing 

 in the irregular occipital excrescence, unarmed metanotum and 

 unspecialized forth and fifth dorsal abdominal segments. The 

 species is much more slender than L. rabdota (Westwood), with 

 which species Brunner compares rahdotula but makes no com- 

 ment on this feature in his inadequate description. 



Type. — 9 ; Pueblo Nuevo de Ocana, Santander, Colombia. 

 September 3, 1916. (M. A. Carriker Jr.) [Hebard Collection, 

 Type No. 469.] 



Size medium; form slender for genus, as slender as in the unspecialized 

 species before us, L. strigiventris (Westwood) and L. inolila (Westwood). Head 

 with surface of occiput smooth, but well sujjplied with nodules and a few blunt 

 spines, and mesad with a large, trilobate, very irregularly nodose, paired ex- 

 crescence.^^ Eye small, length contained four times in that of cheek. Anten- 

 nae simple, slender, extending to base of second abdominal segment. Prono- 

 tum with length nearly twice caudal width, transverse and longitudinal sulcus 

 weakly indicated, the latter briefly replaced by a delicate cannula caudad, 

 surface smooth but thickly supplied with nodules and small nodes. Mesono- 

 tum elongate and slender, with a delicate medio-longitudinal cannula, surface 

 smooth but thickly supplied with nodules and small nodes. Metanotum and 

 median segment with a delicate medio-longitudinal carinula, the sin-face 

 subrugulose 1)ut weakly supplied with nodules and very few small nodes. 

 Dorsal abdominal segments ■ mult icarinulate and nodulose. First dorsal 

 abdominal segment with entire dorsal surface caudad developed into a trilo- 

 bate, equally produced, horizontally extended, foliaceous plate, ^^ the lateral 

 lobes acute-angulate, the median lobe much broader with caudal margin 

 irregularly and broadly convex; from the bases of the lateral lobes, delicate, 

 bluntly subserrate, parallel carinulae extend to the cephalic; margin of the 

 segment. Second dorsal abdominal segment with caudal portion developed 



»3 In allusion to the unwholesome appearance of the irregularly trilobate 

 excrescence on the occiput. 



'■'■' This ex(!rescence is strongly asymmetrical, the sinistral lobe has a svip- 

 l)lementary lobe projecting latero-cephalad near its juncture with the dextral 

 lobe. It is to be expected that additional material will show individual \ aria- 

 tion in so asymmetrical a structure. 



"•• The dextral lobe of this plate is wider, with margins more convex, tlian the 

 sinistral. 



