40 ENTOMOLOGICAL NEWS. [Feb., '05 



2 f^ 3 



Zygolistron trachystictum n. gen. and sp. Type, 

 fig. I, lateral view; fig. 2, cephalic view of head; fig. 3, 

 dorsal view of abdominal appendages. 



Head rather large, occiput rounded and slightly elevated above the 

 pronotum ; vertex slightly descending, interspace between the eyes dis- 

 tinctly exceeding the greatest width of the frontal costa ; fastigium 

 slightly descending, acute, the marginal carinae sharp, shallowly and 

 broadly excavated, foveolse large, trigonal, facing dorsad ; frontal costa 

 a simple sharp carina immediately below the fastigium, dividing at a line 

 with the upper base of the antennae, carina; regularly and very distinctly 

 diverging to the clypeal margin, shallowly but wholly sulcate ; accessory 

 facial carinae distinct and diverging at the same angle as the margins of 

 the frontal costa ; eye ovate in outline, quite prominent, very slightly 

 shorter than the infra-ocular portion of the genae ; antennae slightly ex- 

 ceeding the head and pronotum in length, slightly depressed. Pronotum 

 narrow, subequal, rugoso-tuberculate except the ventral portions of the 

 lateral lobes which are rugose ; cephalic margin rotundato-angulate, 

 caudal margin obtuse-angulate, the angle narrowly rounded and the 

 margin slightly sinuate ; median carina distinctly sub-cristate on the pro- 

 zona and severed by each sulcus ; no lateral carina present, a moderately 

 marked shoulder present on the metazona ; inferior margin of the lateral 

 lobes slightly sinuate cephalad and caudad. Prosternal spine short, com- 

 pressed, blunt, directed caudad. Interspace between the mesosternal 

 lobes very narrow, the lobes sub-contiguous ; interval between the me- 

 tosternal lobes cuneiform, the lobes sub-contiguous at the narrowest 

 (caudal) point. Tegmina not exceeding the apex of the abdomen, 

 rotundato-truncate apically, discoidal field proximad irregularly reticu- 

 late, mesad with the portion between the discoidal and ulnar veins occu- 

 pied by numerous parallel cross veins, those of the medio-discoidal area 

 more numerous than those in the medio-ulnar section; no intercalary 

 vein present. Wings equal to the tegmina in length. Last segment of 

 the abdomen dorsal with triangular branches of the furcula ; supra-anal 

 plate equal proximad, acute and produced distad ; subgenital plate pro- 

 duced, compressed, apical process recurved and exceeding the apical 

 margin by a distance equal to half the length of the entire plate ; cerci 



