x 74 



BOTANICAL GAZETTE. 



[J"iy, 



Viola striata Ait. (fig. 3). — The flower is yellowish white, 

 a few purplish lines on the lower petal forming nectar-guides. 

 The lateral petals are bearded. The stigma is far in advance 



of the anthers, so that self-pol- 

 lination is prevented. The spur 

 is considerably longer than in 

 V^palmata. On three days, be- 



served onty : 



May 



Hymenoptera — Afidce 



(0 



Figure 3. 



tris Cress. 9 , s. 



Synhalonia honesta Cress. $ , s. ; 



(2) Osmia albiventris Cress. 9 , 



s. and c. p., ab. ; (3) O. atriven- 



(4) O. montana Cress. 9 , s. and c. p. 



Andreuidce: (5) Andrena sp. 9 , s. ; (6) Halictus coriaceus 



Sm. 9 , s. and c. p. 



Diptera— Bomhylidce ; (7) Bombylius fratellus Wied. s. 

 Lepidoptera— Rhofalocera: (8) Colias philodice Godt. 

 all reversing except nos. 1, 7 and 8. 



Viola $edata L. var. bicolor Gray (fig. 4).— The flow- 

 ers are larger than in any of the preceding species. The 

 two upper petals are of a deep purple, the others blue, 



the handsome flowers 

 bearing a resemblance 



rn 



to the pansy. The lat- 

 eral petals are not 

 bearded. The lower 

 petal is deeply grooved 

 and is produced be- 

 hind into a curved spin* 

 from 4 to 8 mm. long. 

 The strong style and 



Figure I. 



the anthers project considerably and oppose the way to the 

 nectar, so that the extent of concealment of the nectar is de- 

 termined by the distance from the tip of the style to the tip 

 ot the spur — a distance of from 12 to 16 mm. The staminal 

 spurs are about 4 mm. long and are very slender. The spur 

 ot the lower petal is slender and strongly compressed so as 

 to narrow its cavity. As might be expected, the visitors are 



the longest -tongued bees, though butterflies often 



occur. 



The pollen is shed on the base of the proboscis of the insect 

 Hymenoptera — Afidcn: (i) Bombus virginicus Oliv. 9 

 (14) 2 ; (2) B. separatus Cress. 9 (11-13); (3) B. pennsyl- 



in mm 11InberS "' pftrentb fter the name of ihe bee indicate the length of the probo - 



ill III 111 ft 



