INSECTA MADERENSIA. 545 



§ II. Scutellum transverswin triangidare : pedes gracUes, tarsorum anticorum articulis penultimo et ultimo 



inter se arete connatis (sutiird mgre distlngwenda) . 



413. Xenomma formicanun, WoU. 



X. infuscato-testaceum fere impunctatum nitidum, capite angusto convexo, prothorace subquadrato 

 iutegro, abdomiue basi constricto ultra medium dilatato, segmentis quatuor vel quinque baseos 

 nigrescentibus. 



Long. Corp. liu. 1^. 



Habitat in montibus Maderse, sub lapidibus tmncisque arborum projectis, rarius ; Formicaruni nidos, 

 nisi fallor, colens. 



X. brownish-testaceous, sbining, nearly impunctate, and much acuminated anteriorly. Head narrow, 

 ovate and convex ; with the eyes excessively minute and rudimentary (even smaller than those of 

 the X. jjlanifrons), black, and not at all projecting beyond the surface of the head. Prothorax 

 scarcely broader than the head; subquadi-ate, being of nearly equal breadth before and behind; 

 and without any appearance of a dorsal channel. Scutellum transverse and triangular, and much 

 smaller than in the last species. Elytra extremely abbreviated (more so than the X. planifrons) ; 

 rather narrowed at the shoulders, and waved behind (especially at the outer angles). Abdomen 

 strongly margined, constricted in front and considerably expanded beyond the middle ; all the 

 segments except the ultimate and penultimate ones more or less blackish or piceous, but occa- 

 sionally pale. Antenna shorter than in the X. planifrons, but longer than in the X. filiforme 

 (being rather longer than the head and prothorax). Legs much slenderer than those of the last 

 species. 



Also exceedingly scarce; and, like the last species, confined to lofty altitudes. 

 I have taken it sparingly, during the early spring, from beneath stones in the 

 neighhom'hood of Ants' nests, on the ascent of the Pico d'Ai-ribentao from Eun- 

 chal ; and on the 21st of June 1850, I captured a pair towards the north of the 

 island, — in the almost inaccessible region of the Lombo das Vacas. It may be 

 known from the X. planifrons by its much smaller size, narrower and convexer 

 head, by its shining and almost impunctate surface, differently shaped, unchan- 

 neled prothorax and by its slenderer limbs. The eyes also, both of it and the 

 X. filiforme, are even more minute than those of that insect, — being represented 

 by a mere black rounded point above the lateral margin of the head. 



414. Xenomma filiforme, Woll. 



X. angusto-hneare rufo-testaceum fere impunctatum nitidum, capite angusto convexo, prothorace 

 subquadrato integro, abdomine subparallelo, segmentis quatuor vel quinque baseos nigrescenti- 

 bus, antennis brevioribus. 



Long. Corp. lin. 1^1^. 



Habitat in locis Maderae similibus ac prsecedens, sed rarius ; Xenommatos sola species, nisi fallor, in 



4 A 



