11 



of the opening ; R. macidata of Harris lives beneatli logs and stones. 

 By a comparison of the minutiae of the structure of these three 

 species, it will be seen that R. stygia holds middle ground between R. 

 macidata and R. subterranea in the length and slenderness, as well as 

 the shape of the joints of the antennaB, in the form of the dorsal 

 portion of the thoracic segments, in the spines of the edges of the 

 femora and of the terminal lobe of middle femora, in the stoutness of 

 all the legs, in the form of the ovipositor and the teeth of its inner 

 valves, in the abdominal appendages, of which I have not made 

 mention, in the general contour, and even in the coloration of the 

 body ; there seems to be but one exception where stygia is more nearly 

 allied to macidata than to subterranea, and that is in the structure of 

 that part of the terminal joint of the maxillary palpus, which Bur- 

 meister considers as the organ of touch ; further on, I shall mention 

 their relation to those of the Pacific coast. 



Raphidophora Agassizii, nov. sp. 



Body dirty yellowish brown,* with the segments bordered pos- 

 teriorly — and the pronotum anteriorly — with black. Head yellowish 

 brown, slightly marked above with darker wavy lines, palpi pale yel- 

 low, antenna?' yellowish brown becoming paler toward the tip ; first 

 joint large, flattened, rounded interiorly, joints immediately succeed- 

 ing cylindrical, of nearly equal diameter, but the whole antenna 

 tapering toward the tip ; second joint as long as its diameter ; third, 

 twice a^long ; fourth, one half longer than its diameter : fifth and suc- 

 ceeding joints subequal, half as long as fourth. Eyes black, subpyri- 

 form, subglobose. 



Thoracic segments much mottled with yellowish brown ; there is a 

 faint pale dorsal line which extends over the head, and through the 

 tubercle of the vertex, interrupting a brown band between the eyes. 

 Cox«, upper part of femora, the lower part of the tibiae some- 

 times, and tarsi, yellowish brown ; posterior part of the femora and 

 tibiiB darker; basal portion of posterior femora brownish yellow, 

 barred and obliquely cross-barred with dark brown. All the appen- 

 dages and posterior half of abdominal segments covered with short 

 fine hairs. Under edges of the anterior femora serrated, with a single 

 spine or two upon the inner edge near the extremity ; middle femora 

 with both edges distantly spined ; internal terminal lobe of middle 

 femora armed^with a spine, and sometimes the external lobe has a very 

 slight one ; a double row of alternate spines on the upper side of 

 middle tibiae, and a double row of opposite spines on under side of 

 both anterior and middle tibiae, the terminal ones of all the rows being 

 longest. Posterior femora with two rows of minute black spines on the 

 posterior portion interrupted by larger, distant, nearly opposite 



*Described from alcoholic specimens. 



