LYCAENINAE: STUYMON TITUS. 



811 



the upper spots of the iuuor row on the fore wiiif^s and situatcil on succeeding inter- 

 spaces in pairs ; tlie second pair are in tlio interspaces beyond tlie cell and are 

 subparallel to its limitini; black streak (tlie lower spot the outermost^ and lie mid^vay 

 between it and tlio outer lionler ; the upper pair are c)n a line with a point midway 

 between the discoidal streak and tlie second pair, but not quite parallel to them ; the 

 lower pair in tlie median interspaces arc on a line with the upper pair; the remainder 

 of the row, wlien not obsolete, as it lias a tendency to become in the male, consists of 

 two transverse streaks, edged, like the spots, with white: the first straight, lient, 

 waved or curved, Init usually with a direction suliparallel to the discoidal streak, but 

 broader tlian it and crossiiiir nearly the whole of the medio-subinedian interspace, its 

 outer edge either nearly continuous with the interior edge of the lowest pair of spots 

 (<J ), or partly or wholly on a line with the discoidal streak ( ? ) ;* the second, in the 

 succeeding interspaces, is always bent, the limljs straight, the upper third nearly on a 

 line eitlier witli the streak above ( <? ") or witli the discoidal streak ( ? ) , the other por- 

 tion bent inward nearly at a right angle and contiguous to the inner border of the wing. 

 Beyond this row is a submargiiial series of eight large, roundish, deep orange spots, 

 usually larger in the female, sitmited in the same interspaces as the spots of the inner 

 row, each spot bordered interiorly and, to a less extent, exteriorly by a bent, often 

 angulated, slender, black streak, surmounted, especially interiorly, by a few pearly 

 white scales ; the two spots next the anal angle are usually confluent and the slender 

 space between the black exterior edging and the black line bordering the whole wing 

 is mostly tilled with a mixture of pearly white and brownish scales. 



Abdomen covered with soft, slaty brown scales; beneath yellowish gray. Alations 

 of upper organ of male (34 : 23) witli nearly squared upper and posterior edges, the 

 latter produced below into a slight angular lobe; lappet of inferior edge longer than 

 broad, well rounded; clasps beyond tlie gibbous portion tapering regularly to a fine 

 point; this lamina not so long as the basal portion, half as broad and less than three 

 times as long as broad. 



Male specimens from Iowa and Minnesota ditfer from all others that I have seen in 

 having the spots of the inner row of both wings much larger, being nearly half as 

 large as the submarginal spots of the hind wings. 



Secondary sexual peculiarities. The male stigma is mentioned in the description 

 of the wing, as is also tlie remarkable diflerence in the contour of tlie wings in the 

 two sexes. The scales found in tlie stigma (46 : 27) are regularly and gently tapering, 

 broadly rounded at base, truncate with slightly rounded angles at tip, more than 

 four times as long as the median width. Length of lamina, .11 mm. 



Egg (65: 11). Deep green, the projections whitish, giving a hoary bloom to the 

 egg. The projections are about .005 mm. apart, and where highest, as on the outer 

 walls, nearly half as high as that; at the base the coarse cell walls continue a short 

 distance after the projections have altogether ceased, making coarse triangular cells, 

 but fully half the diameter is free of markings ; above, the projections slightly decrease 

 in size as tlie micropyle (68 : 4) is approached and suddenly stop at its edge, leaving a 

 circular pit .16 mm. in diameter, tUhnl with a delicate tracery of polygonal cells about 

 .015 mm. in diameter. Diameter of egg, .9 mm. ; lieight, .5 mm. 



Caterpillar. First stage. Head jot black ; mouth parts pale brown ; tips of mandi- 

 bles black. Body pale brown , delicately shagrecned with tine black points ; the lozenge- 

 shaped shield of the first thoracic segment slightly darker, infuscated arcfuud the 



•These sexual differences arc due to the differing form of the aiial angle in the sexes. 



