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subject to which I have access. I submitted a sketch of it, together 

 with au extensive description of both sexes, to Dr. S. W. Williston, our 

 best authority upon this group of insects, and he writes me that he 

 never saw such a process in any species that he has examined, nor can 

 he find any published reference to it; he further states that the other 

 characters of this species agree quite well with those of the genus 

 Baumhauria, a single species of which has heretofore been described, 

 having been bred from a Bombycid belonging to the genus Arctia. 

 Our species, however, differs very decidedly from the above genus by 

 characters other than the abdominal process, and therefore I do not 

 think we run any great risk in erecting a new genus for its reception, 

 a description of which I append herewith : 



Celatoria, n. gen. — Head large, broad as thorax, much broader than high; front 

 iu male only slightly wider, in female one-fourth wider than transverse diameter of 

 «ye — iu both sexes with a single row of bristles each side of frontal stripe extending 

 nearly to insertion of arista, and with two fprwardly directed bristles on the crown 

 outside of each of these rows; face much retreating below, bristles bordering median 

 foveas strong, extending nearly to the lowest in frontal row ; vibrissal bristle strong; 

 epistoma but slightly projecting ; cheeks small, bristly ; palpi well-developed, thick- 

 ening toward its tip ; proboscis soft, wholly retractile, furnished with a large labella ; 

 autenusB reaching nearly to oral margin, third joint at least four times as long as the 

 second, rather slender and nearly of an equal width, the upper edge nearly straight; 

 arista sub-basal, very short pubescent, distinctly two-jointed, second joint greatly 

 attenuated on its apical half. Eyes bare. Thorax nearly as long as the abdomen, fur- 

 nished with stout bristles. Sciitelhtm with three pairs of marginal bristles and a shorter 

 pair of dorsal ones. Abdomen oval, thinly depressed pilose, and with several pairs of 

 dorsal bristles besides the usual lateral and anal ones; five abdominal segments, the 

 first nearly as long as the second, the fifth in the male small, in the female concealed 

 in the fourth ; venter in the female normal, in the male furnished with a large, lon- 

 gitudinally compressed process on underside of second segment, apex of this process 

 studded with numerous small tubercles ; a large cavity in posterior end of venter, in- 

 closing the fifth segment and contracted anteriorly into a narrow groove which ex- 

 tends to the second segment. Legs furnished with bristles; posterior tibiae not cili- 

 ated. Wings of the usual Muscid type, first posterior cell terminating close to tip of 

 wing, closed in the margin ; curvature of the fourth vein in middle of last section of 

 that vein, rounded, and destitute of an appendage; great cross-vein slightly nearer 

 to this curvature than to the small cross-vein, nearly perpendicular; a stout bristle 

 at junction of second and third veins. 



Type, Celatoria crawii n. sp., which may be further characterized as 

 follows : 



M'le. Frontal vitta blackish-brown, sides of front white, tinged with yellow; face 

 white; palpi reddish-yellow; antennae black. Thorax grayish-black, destitute of 

 stripes, the bristles not disposed in rows. Scutellum grayish-black. Abdomen 

 black, mottled with gray, destitute of reddish spots; fifth segment scarcely one- 

 fourth as long as the fourth ; a posterior dorsal pair of bristles on the first and second- 

 segments, and a posterior transverse row of bristles on the third, fourth, and fifth seg- 

 ments, besides several along the sides of the abdomen ; venter coucolorous with the 

 dorsum. Legs black, claws and pulvilli much shorter than last tarsal joint. Wings 

 hyaliue. Alulae white. Halteres yellow. 



Female. Same as the male except that there is a median pair of bristles on the 

 second, third, and fourth segments. Length 4^ to S^""™. 



