HK.SPKKIDI: PIIOLI.SORA CATULLUS. 



1521 



jection ; upper lobe very nearly apical, small, rounded, directed backward; docked or 

 roundly e.vcised e.\treniity of the blade so convex as to n|)pear semicircular on an end 

 view, the upper anirle a little produced and prickly, the lower bearing a recurved, in- 

 terior, triangular process terminating in a sharp thorn and having the edges minutely 

 denticulate. 



Described from 17 (J , 18 9 . 



Accessory sexual peculiarities. The costal fold of the fore wing of the male 

 encloses some very long attenuated rods of an exceptional length, being sometimes 

 .75 mm. long (48 :1a); plenty of twisted flexible cliain-bristles with links varying 

 in number but apparently not exceeding twelve (1 k), which seem to vary in length 

 and width according to the point of view but not to exceed .02 mm. in length, and 

 which are not flagellate at tip but well rounded ; besides these a great assortment of 

 forms of small scales but mostly boat-shaped (1 b, e-i), drawn on the plate to the 

 same scale as the last, and apparently of a granular structure; and finally irregular, 

 rounded and striate cover scales (led) close the opening of the fold. 



Egg (66 : 21). Vertical ribs about eighteen in number, horizontal lines about twelve 

 to fourteen between each set of vertical ribs, leaving uo part of the field flat; ridges 

 seven in number, minutely tuberculate and radiate from the centre in a stellate manner. 

 Micropyle rosette (69 : 2) formed of a central, minute, circular cell, from which nine 

 kite-shaped cells, twice as long as broad, radiate, these by a row of nearly circular 

 cells, their diameter equal to the length of the kite-shaped cells and these by a still 

 larger hexagonal series, whose diameter averages about .0125 mm. Color according to 

 Riley yellow, inclining to carneous ; specimens sent me by Miss Murtfeldt were white, the 

 extremebase reddish brown, probably at a later period. Height of egg, .44 mm. ; width, 

 .58 mm. ; micropyle pit, .11 mm. in diameter. 



Caterpillar. First stage. Head (80: 43) black, almost smooth, but delicately, very 

 shallowly and irregularly vermiculate ; bristles dusky ; mouth parts black. Body yel- 

 low, black at tip ; the bristles of the body pellucid ; legs dusky ; prolegs of the color of 

 the body. Breadth of head, .3 mm. ; length of bristles, .03 mm. 



Second stage. Head black, made slightly gray by the white hairs. Body pale yel- 

 lowish green, greenest in the middle of the body, dotted rather sparsely with pale 

 papillae, each with a short, pallid hair. Dorsal shield of first thoracic segment of the 

 color of the head, unbroken in the middle above, but with a separate piece for the spir- 

 acle. Legs and prolegs concolorous, first pair of legs infuscated. Length, G.5 mm. ; 

 width of head, 5 mm. 



Third stage. Head as before. Body pale yellowish green, the last thoracic and first 

 four abdominal segments pale green, all with a moderate scattering of pale yellowish, 

 small but unequal papillae, giving rise to short, pale hairs. A faint, slender, green, 

 dorsal line, and faint, slender, yellowish lateral and stigmatal lines, largely from the 

 clustering of the papillae ; dorsal shield of first thoracic segment as before, but with a 

 distinct but very slender medio-dorsal break. Spiracles pale yellow. Legs and pro- 

 legs as before. Length, 8.5 mm. ; breadth of head, 1.25 miu. 



Fourth stage (77 : 21). Head and dorsal shield of first thoracic segment as before. 

 Body pale bluish green, the last two or three segments and all the skin-folds tinged 

 ■with yellowish, the papillae pale, with hardly a tinge of yellow; dorsal stripe as 

 before, but the lateral and stigmatal lines very faint and inconspicuous ; spiracles 

 luteous. Legs and prolegs concolorous. Length, 12 mm. ; breadth of head, 2.25 mm. 



Last stage (77 : 16, 23). Head (80:44) blackish brown, deeply infuscated along the 

 middle line, especially above, behind deepening into black, covered with a thin pile of 



191 



