Vol. I] WILLIAMS— BUTTERFLIES AND HAWK-MOTHS 309 



mancinella (a poisonous tree, which is common along the 

 shores), and Psidium. At Iguana Cove, the larvae were 

 observed in several instars and were either of a pale sea-green 

 or reddish-brown color, as described by Edwards, Holland, 

 and others. The larva has a habit of stretching itself appressed 

 to a twig, and is thus often difficult of detection. The pupa 

 has been well described by Edwards (Ent. Americana, III, 167, 

 1887), and a number of these prettily striped objects were 

 found beneath Hippomane trees (Iguana Cove), by disturbing 

 the loose mouldy soil and by overturning pieces of lava. 



D. ello is an exceedingly abundant insect in the American 

 tropics and occasionally ventures well up into the temperate 

 latitudes of North America. It is also recorded from the 

 Galapagos Islands by Rothschild and Jordan. 



There are nine $ and eight 5 in the Academy's collection, 

 besides three pupae and several larvae preserved in spirits. 



Alar expanse: $ 67, 70, 71, 72, 72, 73, 73, 74, 78=7.22 

 mm. 



$ 72, 72, 74, 76, 78, 79, 82, 91=78 mm. 



5. DilophonotaobscuraFabricius, Syst. Ent., 538, 1775. 

 Subsp. conformis, Rothschild and Jordan, Novitates Zoolog- 

 ies, Supplement Vol. IX,^ 369, 1903. 



The description of the insect in Novitates Zoologicae, reads : 



"Erynnis obscura conformis, subsp. Nov. $ 2 . Sexes similar ; $ with- 

 out a longitudinal streak on the forewing, and having the thorax as gray 

 as 9 . Distal margin of hindwing rather darker in the upper half than in 

 the ordinary form, and the post-discal line of dots more distinct. Hah. 

 Galapagos Island, Albemarle; end of March to May, 1902 (Beck); type: 

 Top of crater, S. E. Albemarle, 27, III, 1902. In the Tring Museum 

 4 5^,4 $ 5." 



There are 4 $ $ and 32 2 9 in the collection of the Cali- 

 fornia Academy of Sciences, and there is but one 5 among 

 these which has the thorax as dark as in the $ $ . These have 

 the thorax slightly darker than in the 2 . The thorax of the 

 latter sex, is nearly concolorous gray, while in the $ , several 

 longitudinal lines of brownish gray are evident, which are 

 almost or entirely absent in the 2 2. Quite a common insect 

 in the Tagus Cove region, Albemarle Island, in March and 

 April. It was easily attracted by light and a number were 



