( lol ) 



foretiliia anil -tarsus jirolougeil ; first segment (if midtarsns witli comb, but only 

 the most proximal bristles long ; first segment of hindtarsns only as long as 

 the four other segments together ; long apical s])ur of hindtibia half the length 

 of tlie first tarsal segment. Paronychium reduced, /vit/i short lobe. 



c?. Tentli abdominal tergite elongate, sharply jiointed, convex above 

 (PI. XXVIII. f. 1(1, dorsal view), abruptly curved downward, forming a long 

 hook (PI. XXVIII. f. II, side-view) ; steruite with a very broad lobe (PI. XXVIII. 

 f. 10), which is very feebly sinuate. Clasper comparatively shorter and more 

 rounded, especially dorsally, than in c//ergis; harpe somewhat similar to that 

 of r/iersis, but the ventral lobe very short, and the long process more oblique 

 and somewhat undulate (PI. XXXVIII. f. 8). Penis-sheath (PI. XXIX. f. 4) 

 with a rather short, blunt process which is concave on the inner side. 



?. Vaginal plate represented by PI. XX. f. 19 in a ventral view, by f. 20 in 

 a side-view ; a large subapical cavity, in which the vaginal orifice is situated, partly 

 covered in front by a convex lobe. 



Larva green ; side-bands white with narrow black anteiior border ; born smooth, 

 black above and below. — Food : S^mpkoricarpus 7-acemosus. 



Pujia : tongue-case free, rounded, 8 mm. long. 



Two broods. 



There occur, in the same places, two forms differing in the colour of the thorax. 

 These forms are said to be seasonal (Smith, I.e., p. 234). The dated material in the 

 Tring Museum and other collections confirms on the whole Mr. Bruce's positive 

 statement, referred to by Smith, I.e., that of the two broods one is always albescens 

 (with the black thorax) and the other vancouverensis (with the grey thorax). 

 However, some of the specimens of the early brood, or rather of an early date, are 

 as black on the thorax as some of the later individuals, and others are intermediate. 

 This seeming irregnlarity may be due to the phenomenon known of other Spkinijidue 

 thai imjiae often lie over from one brood to the other, or longer. The black notum 

 is doubtless the younger character, and both broods of the sjiicies may be on the 

 way towards developing into a black-backed insect. 



Further researches in this respect are necessary, and we hope that the keen 

 entomologists on the other side of the Atlantic will not be slow in making further 

 careful observations. We here can do no more than merely state that the two 

 forms are connected liy intcrgradations and are identical in structure. 



a. If. raiicoucerensis f. cancouvereii.si.'i (PI. XIII. f. 3, c?.) 



Sjihiiir viincviicerciisis Edwards, l.r, (A'ancouver, August) ; Smith, I.e. p. 234 (1888). 

 Spliiiu- rmhti Strecker, l.r. (1878) (Arizona). 



6 ?. Thorax grey. — The spring form from hilieiiiafed pupue ? 



//'. //. Kineouceremis f. alljeseeim (I'l. XIII. f. 4, cf). 



Sjiliiiij- iilhrweiiH Tupper, I.e. (1881) (Colorado); Haiib., ('niiad. Kut. xxLv. p. 21)2 (ISiJ?) (Mani- 

 toba, vii.) ; id., /.(•. x.\xi. p. 52 (18'J'.l) (Manitoba); Heath, Canad. Eut. xxxii. p. 1)4 (I'JOO) 

 (Manitoba, vi.). 



S ?. Tliorax black. — The summer torm ? 



llah. Pacific Subregiim : from California and I'ritish Columliia,, westward to the 

 <'a«t side of the Kuckv Moiujlains. 



