398 The Ohio Naturalist. [Vol. Ill, No. 3, 



b}^ its resemblance to the fruit steins and also by the sticky nature 

 of the fruit. 



J/, huiiiilis Stal. — This species seems to be strictly confined to 

 the ray less golden rod {BiQclovia doi/^i^/as/i group)' The female is 

 of a pale green color, similar to that of the new growth upon 

 which it stays. The male has a shining black stripe down the 

 back and depends upon its agility in dodging around the stems 

 for protection. The adults appear in July, the males having 

 mostly disappeared by August ist. It is a common species in 

 southwestern Colorado and occurs sparingly well up in the 

 mountains west of Fort Collins, Colo., but has never been taken 

 in the foot hills or on the plains, although the Bigelovia abounds 

 there. 



J/, robusta Uhl. — This small pale green form is found abund- 

 antly on the bushy Atriplex {A. canescens) throughout the south- 

 ern half of Colorado and down into Arizona. The plant appears 

 almost white, but the young shoots and stems where the insects 

 rest are pale green. 



M. bisignata Ball. — This pretty brown-marked species occurs 

 on Gidierrezia eifthamiac, a little yellow- flowered Compositae that 

 grows in small clumps all over the plain region of Colorado and 

 well up into the mountains. There appears to be two broods of 

 this species, one appearing late in May and another in September. 

 The difference in altitude affects the time of appearance so much 

 that it is hard to determine the number of broods except where 

 the same locality is under observation during the entire year. 



GENUS PEDIOPSIS. 



The food plants of a number of our species have already been 

 definitely recorded and a few more are added here. The willow 

 forms, as far as studied, seem to be as strictly confined to one 

 species or group of willows as are the willow-inhabiting forms of 

 Idiocerus. 



P. tristis Van D., and tr'uiiacnlata Fitch. — were both injuri- 

 ously abundant on cultivated plums at Fort Collins, Colo , in 

 1902. The adults of the latter species appeared the first week in 

 July and tho.se of tyistis a week or more later. 



P. siituralis O. and B. - seems to be strictly confined to the 

 black willows {Salix amygdaloidcs and nigra), where it is fairly 

 common locall>-. 



P. crythyoa'pliala G. and B. — An abundant species on the 

 narrow-leaved willow (.S". longifolia). By an oversight the habitat 

 of this species was omitted in 6sb. and Ball's review of this genus. 

 It is known from Iowa, Nebraska, Kan.sas and Colorado. 



P. t)ivia/is Ball. — This species occurs abundantly on the black 

 willows (.v. ai)iygda/oidcs) in Colorado. The adults appear by 

 the first of July. 



