8 JOHN B. SMITH. 



The clasper, arising behind the middle, is long, slender and well 

 curved. 



The following seven species, emarginata, holocinerea, georgii, 

 puella, oregonensis, Winnipeg and unimoda, have a slender black 

 longitudinal line, which extends beyond the basal half" line and is 

 not turned into it to form an oval paler patch at the costal area of 

 base. 



Of these, three — eiaargintda, holocinerea and georgii — are so 

 closely allied that their separation is in some cases a matter of tact 

 rather than based on positive characters. They are local or Dar- 

 winian species and agree in a strigulate maculation of i)rimaries, on 

 which the median transverse lines are either lost or marked on the 

 costal region only. The male genitalia are of one type, and while 

 there are differences in each case they are not beyond the reach of 

 individual variation supplemented by distortion in mounting. This 

 last factor deserves mention here as it must be taken into consider- 

 ation in all the following species of the genus. The structures are 

 actually and projwrtionally large, strongly curved and convex, and 

 the clasper not only curved into a hook, but also twisted inwardly 

 and at an angle from the harpe. Flat mounting on a slide is there- 

 fore impo-ssible without distortion; mounted in a cell no two speci- 

 mens are so exactly in the same position, that seen at the same plane 

 they give exactly the same figure, x^s all the sketches are made 

 with the camera lucida, differences could be made to appear even 

 where none exist. Wherever possible several mounts have been 

 made for each species, and the one selected for figuring has been 

 that which best gave what seemed to be the characteristics of the 

 species. 



In the three species under consideration the harpes are long, 

 rather narrow^ curved and convex ; the tip is emarginate, the lower 

 angle drawn out into an acute point, the upper into a narrow, blunt 

 angle. The upper margin near the tip is serrated, and there is a 

 curved enlargement almost at the base of the clasper, which is also 

 toothed. The clasper is a long, curved and twisted corneous hook. 



Emarginata is very whitish gray, the longitudinal streakings 

 along the veins very narrow and inconspicuous, and the ordinary 

 spots obsolete or only feebly marked. The s. t. line is indicated in 

 all the specimens by a slightly darker shade, but it is not at all 

 prominent in any sense or case. The species is quite as pale as any 

 fagina, but has the black basal line obvious in all ca.ses. The fig- 



