208 PliOCKi: DISCS of the yATlONAL MUSEUM. vol.. XX. 



niarkt'd on ilie prozoiia by tlie flavoiis stripe bordering the piceons patch ; 

 median 'carina i)erciirrent, dull and heavy, more pronounced on the pro- 

 zona than on the metazona: front margin subtruncate, feebly and nar- 

 rowly tiaring in the male, hind margin broadly and roundly but not 

 deeply emargiinite; prozona punctate next the front margin, distinctly 

 longitudinal ( male) or quadrate ( fenndc), mesially twice as long (male) or 

 fully hair as long again (fennile) as the finely punctate metazona. Pro- 

 sternal spine appressed conical and slightly retrorse (nnile) or erect, 

 conical (female), rather longand slender; iuters])ace between mesosternal 

 lobes transversely sulxjuadrate (male ) or a little transverse (female), the 

 metasternal lobes subattingcnt (male) or somewhat api>roxr' ite 

 (fenuilc). Tegmina alxmt as long as the ])rozona, elliptical, about liree 

 times as long as broad, broadly rounded at tip, lateral, widely distant, 

 black with testaceous veins. I'\)re and middle ^eiiiora somewhat en- 

 larged especially in depth in the male; hind ft... '\ tlavous, more or 

 lesc* lon}»;itudinally infuscated or ferruginous, especially on or next the 

 carinae, the genicular arc piceous, the lower genicular lobe wholly pallid ; 

 hind tibiae pale dull tlavous, delicately mottled with ferruginous, the 

 spines black excepting at base, eight (female) or ten (male) in number 

 in the outer series. Abdomen feebly carinate, nearly unilbrm in color, 

 the extremity subclavate in the male, a little recurved, the supraanal 

 plate triangular, roundly acutangulate at tip, the surface vaulted, with 

 a large subbasal rounded br.sin taking the place of the usual median 

 sulcus, and into which falls the furcula, consisting of a pair of very 

 slender, parallel and adjacent, subequal, cylindrical lingers, extendim,^ 

 less than a third the distance across the plate; cerci slender, gradually 

 incurved but otherwise straight, compressed blades, tapering at the 

 very base, but beyond subequal, rounded at tip, considerably shorter 

 than the supraanal plate; subgenital ])late small, subpyramidal of 

 about ecpial breadth and length, the margin apically anguhite, entire. 



Length of body, male, 17.5 mm., female, 31.5 mm.; antennae, male 

 and female, 11 mm. ; tegmina, male, 3 mm., female, 5 mm. ; bind femora, 

 male, VI mm., female, 17 mm. 



One male, 1 female. Tepic, Jalisco, Mexico, November, Coll. Calif. 

 Acad. Sc. (L. Eruner) ; Cape St, Lucas, Lower California ( ?), J. Xantus. 



The female, collected by Xantus (presumably at Cape St. Lucas), is 

 the one referred to by me in my original description of M. cridus ;is 

 belonging to that species, but it dift'ers from it (and agrees with M. 

 hfonphreysii) in the emarginatiou of the posterior border of the ])ro- 

 notuni, and difiers from both in the greater robustness of the body, 

 especially in the metathoracic region. It is quite possible that the 

 male and female here brought together do not properly belong to one 

 species; there is great disparity in size and, as the description shows, 

 some unusual disagreements between sexes of the same species; but 

 they certainly belong in close proximity, even if distinct ; if they should 

 prove di.stinct, the name should be retained for the male, from which 

 the description (especially in colors) has principally been drawn. 



