148 Tryon Reakirt on Color adian Butterflies. 



In the Catalogue of the British Museum, there are given Lycsena, 

 n. 2792 and Polyommatus, n. 2796, as from the locality of the Rocky 

 Mountains; these will probably be id entitle J from among the prece- 

 ding species. 



Polyommatus Helloides, Boisd. 



Hub. — Rocky Mountains, Colorado Territory, California. (Coll. 

 Tryon Reakirt.) 



A very abundant species in both localities, and so far as I can judge 

 from the examination of a very large series of specimens, subject to 

 little or no variation, throughout its entire range. 



Polyommatus Castro, nov. sp. 



Hub. — Rocky Mountaius, Colorado Territory. (Coll. Tryon Rea- 

 kirt.) 



Ahilc. Upper surface brown, with a broad blackish-brown border, 

 on the outer margins of both wings; a brilliant violet reflection glosses 

 the entire surface, rarely absent. Eleven black spots on the prima- 

 ries arranged thus: one at the end of the cell, and two others within 

 the cells at equal distances between the first and the base; a transverse 

 row of seven, between the cell and the outer margin of which the last 

 is duplex; the eleventh spot is found directly under the origin of the 

 first, median veinlet. Secondaries, with a long black discal bar, and an 

 intermediate row of seven black spots, between this and the margin, 

 of which the third, fourth and sixth are the largest: a marginal series 

 of fulvous lunules ranging from one to four in number. 



Under side; primaries, yellowish ochreous, becoming grayish at the 

 apex ; the black spots of above, reproduced much larger, to which are 

 added three or four semi-lunes, forming a sub-marginal row, running 

 up from the inner angle and a small spot between the eleventh of the 

 upper surface and the base. Secondaries, gray, brownish-gray, and 



Secondaries present two black spots, oae near the middle of the abdominal 

 margin, the other, in the medio-central interspace, just below the cell : the 

 anterior series of spots belonging to the double sub-marginal row, here assume 

 the form of slender brownish crescents, while the posterior are rounded, and 

 the three or four nearest the anal angle, glossed with a metallic golden green : 

 the two series are separated by lemon yellow lunules, becoming indistinct to- 

 wards the outer angle : the terminal line, on both wings, is alternately white 

 and brownish, the length of each space of color, being about equal to that of au 

 interspace. 



Expanse 1.25 inches. 



JJafi.-^California, (Coll. Tryon Reakirt.) 



Allied to Anna on the upper surface, but differing very decidedly from any 

 known species on the under. 



