512 REPORT OP THE COMMISSIONER OF AGRICULTURE. 



SiMULTUM PECUARUM, n. sp. — 9- (Plate VIII, Fi^. 3, and dorsal view, Fig. 5). 

 Lcir^h, 2.5 """ to 4 '"■". Head (Plate VIII, Fig. 2), uniform grayish-slate, clothed 

 with short yellowish hair, which becomes longer behind the eyes; eyes black, with 

 coppery or brassy reflections; anteiincc black, with whitish pubescence, and with a 

 few bristles on two basal joints, which are tinged with red; joints 1 to 11 gradually 

 diminishing in thickness towards the last, joint 1 shortest, joints 2 and 3 twice as 

 long as joint 1, joints 4, 5, and 6 as long as joint 1, joints 7, 8, 9, and 10 gi'adually 

 increasing in length, last joint fusiform, twice as long as joint 10; maxillary palpi 

 a little longer than antenna?, blackish, with long grayidh bristles. Thorax gi-ayish- 

 slate, more or less densely covered with short yellow hairs, and with usually very 

 distinct markings, consisting of two mediodorsal and two subdorsal, broad, longi- 

 tudinal, sooty-black bands, of wliich the latter ciirve to posterior edge of patagium, 

 which is reddish at tip; lateral edges of prothorax Avith fine black sutures; under 

 side of thorax uniform grayish-slate, with sparse yellow hairs; space around the one 

 large stigma lighter; halter es opaque, reddish- white; legs uniform reddish-brown, 

 densely covered with yellowish hairs; tips of tarsi blackish: wings subhyaline; 

 larger veins and base reddish-brown. Abdomen nine-jointed, joints subequal in 

 length, except the last 2, wliich decrease in length; a longitudinal, broad bluish-gray 

 dorsal band extends from near base of segment 2, where it is broadest, to the tip, 

 curving downward to the anterior lateral edge of segment 7. below this band later- 

 ally the color is blackish-brown, with the exception of a broad bluish-^'ay transverse 

 band on the posterior edge of each of segments 1 to 6 ; under side ot abdomen uni- 

 form brownish-gray, without markings; abdomen densely covered with yellowish 

 hair, which is very long upon the posterior edge of segment 1, forming an overlap- 

 ping fringe. 



$ , — Length varying from 1 . 5""° to 3.2"™. Differs considerably from female. Head 

 (Plate VIII, Fig. 1,) not visible from above, being occupied by the very large conflu- 

 ent eyes ; the remainmg parts below the eyes are black, with black hairs and bristles ; 

 eyes composed of two different kinds of facets, those above bein^ very large, as 

 large again as those of the female, and those in front and surrounding the dwarfed 

 trophi very minute, the dividing line between the two sizes being abrupt [the figure 

 is not acciu'ate] ; antennae similar to those of female, more pronounced in color, 

 both the black and reddish bemg more vivid ; maxillary palpi black, and shorter than 

 the antennse. Thorax black above, with sparse yellow hairs ; legs somewhat lighter 

 in color, tips of tarsi not black ; hairs upon legs longer than in those of female. 

 Wings hyaline, veins and base yellowish-brown. Abdomen black, with grayish- 

 white posterior margins to segments, dorsally and laterally, and covered with longer 

 yellowish hairs. 



Described from two bred specimens. 



Larva (Plate VI, Fig. 1 and Fig. 2, showing head in three positions). — Average 

 length when full grown, 7'"'" to 8"^'". Subcylindrical, the club-shaped posterior third 

 of body being twice as stout as the thoracic joints, and joint 4 the most constricted. 

 Translucent when living, dirty white in alcohol; immaculate in a very few speci- 

 mens ; distinctly marked in the great majority with brownish dorsal cross-bands in 

 middle of joints, leaving free a white mediodorsal longitudinal line ; thoracic joints 

 with three irregular rings of the same color ; under side more Or less irregularly 

 spotted with brown. Head subquadrate, horny, yellowish-brown, with a number 

 of brown spots and lines in regular order (as in figure) and two roundish approximate 

 ocellate black dots on each side under the skin, and seemingly rudimentary organs of 

 sight, from which the future compound eyes originate: antennrc (Plate Vl, Fig. 5 a) 

 uniformly pale, three-jointed, about one-third as long as greatest width of head; Joint 

 1 very stout, fully four times as thick as 2, which is a little longer than 1, straight, 

 slightly tapering towards tip, joint 3 extremely small, a mere triangular tip : 

 vientum (Plate VI, Fig. 3 a) subtriangular, with apex cut away and replaced by 

 three groups of very small teeth, of which the central group consists of three teeth, 

 the middle one largest, and the groups on side, of four teeth, of which the second 

 from center is largest; sides of mentum, near apex, with two small teeth each; all 

 the teeth are chitinous and black, a long erect bristle, pointing upward and inward, 

 near each side of mentum: labtmm (Plate VI, Fig. 3 b) horny densely covered with 

 hair: mandibles (Flate VI, Fig. 5 b and c) resembling in shape the profile of the in- 

 verted last joint of the liuman thumb, with a series of teeth in place" of the nail; teeth 

 diflScult to see, owing to the presence of five distinct brushes of hair; upon extreme 

 lower tip of mandibles three large teeth, below them a series of eleven slender and 

 very pointed teeth, of wliich the first two are the smallest, teeth 3 to 9 increasing 

 and teeth 10 and 11 gradually decreasing in length; a second series of teeth below 

 them consists of two triangular teeth, of Avhich the first is largest: maxilla (Plate 

 VI, Fig. 6) stout, fleshy, with an internal thumb-shaped lobe; maxillary palpus two- 

 jointed, first joint cylindrical, second very short, crowned with a regular circular 



