68 MEMOIES OF THE NATIONAL ACADEMY OF SCIENCES. 



and extremities, paler; some faint reddish-brown spots on upper surface of thoracic segments. A 

 much depressed, scarcely perceptible carina along the dorsum. All the appendages densely cov- 

 ered with short, fine, microscopic hairs. 



Antennae dark brown at base, becoming paler toward the tip; first joint stout, somewhat 

 flattened anteriorly, obliquely truncated interiorly at the base; second joint half as long and as 

 broad as first, compressed anteriorly; third cylindrical, as long as first, at base of the same 

 breadth as second, but narrowing rapidly though but slightly ; remainder of unequal length, but 

 averaging at first half the length of the third joint, slowly diminishing in size, so that the whole 

 tapers very gradually to the very delicate extremity. Tip of the last joint of the maxillary palpus 

 with a slight excavation interiorly; eyes black, subovate, subglobose. 



Four anterior coxae carinated externally, the carina of the two anterior being produced into a 

 central spine. A double row of distant, alternate, short spines on under side of the four anterior 

 tibiae, with two upon either side at the extremity, of which the lower is largest, embracing the 

 base of the tarsi; posterior tibiae with a double row of minute sharp spines, extending nearly the 

 whole length of the hinder portion, raised at a very small angle, interrupted by longer, distant, 

 anil alternate ones, elevated to a higher angle; upon the anterior lower third are two approximate 

 rows of distant spines; three spines at the extremity upon either side, embracing the first joint of 

 the tarsi ; the first and third of a nearly equal size and appearance to the larger tibial spines, 

 while the second is three times as long and thickly covered with short, fine hairs ; all the longer 



spines are movable, and tipped with reddish- 

 brown, approaching to black ; terminal half 

 of claws black. 



Ovipositor rufo-testaceous, swollen at 

 the base, flattened in the terminal two-thirds, 

 nearly straight, slightly curved upwards and 

 ensiform at the tip, produced to a sharp point, 

 with five or six serrations on the lower edge 

 of extremity of inner valves, but hidden by 

 the outer ones ; analcerci tapering to a fine 

 point, furnished, besides the short hairs com- 



Eig. W.-Hadencecus subterraneus Scudder. Natural size. Emerton del.^ mon to all appendages, with exceedingly fine 



long ones, shortening towards the apex. 



Measurements (the average of many specimens) : Anterior femora, .54 inch ; anterior tibiae, 

 .59 inch; middle femora, .49 inch; middle tibiae, .59 inch; posterior femora, .84 inch ; posterior 

 tibiae, 1.08 inches ; antennae (longest), .4 inch; maxillary palpi, .50 inch ; ovipositor, .52 inch ; cerci, 

 .26 inch ; whole body (as curved), .66 inch. 



"This species is the one inhabiting Mammoth Cave, of Kentucky, and the adjoining White's 

 Cave; they were found throughout the cave to the remotest parts (7 miles or thereabouts), though 

 not near the entrances, especially in damp, moist situations, where they abound ; they were found 

 in especial plenty about Martha's Vineyard and in the neighborhood of Eichardson's Spring, 

 where they were discovered jumping about with the greatest alacrity upon the walls, where only 

 they are found, and even when disturbed clinging to the ceiling, upon which they walked easily; 

 they would leap away from approaching footsteps, but stop at a cessation of the noise, turning 

 about and swaying their long antennae in a most ludicrous manner in the direction whence the 

 disturbance had proceeded; the least noise would increase their tremulousness, while they were 

 unconcerned at distant motions unaccompanied by sound, e^en though producing a sensible cur. 

 rent of air; neither did the light of the lamp appear to disturb them. Their eyes and those of the 

 succeeding species are perfectly formed throughout, and they could apparently see with ease, for 

 they jump away from the slowly-approaching hand, so as to necessitate rapidity of motion in 

 seizing them. Late in October females were obtained enormously distended with eggs." (Scudder.) 



It will be interesting to know whether this cricket in small caves varied as to its eyes from 

 those living in large ones. The specimens were compared with Mammoth Cave examples as 

 standards. 



