NO. 1124. REVISION OF THE MELANOPLI SC UDDER. 19 



all exceeding in length the pronotum. Pronotum enlarging regularly 

 and slightly (male) or considerably (female) from in front backward, the 

 disk nearly plane, separated by percurreut lateral carinae (as distinct 

 as the percurrent median cariua) from the subvertical lateral lobes, the 

 front and hind border truncate or sub truncate, the nearly smooth 

 prozoua less than twice as long as the rather feebly punctate metazona, 

 rather longer than broad, divided in the middle by a feeble transverse 

 sulcus, followed at less than half the distance to the metazona by a 

 doubly arcuate sulcus at least as distinct. Prosterual spine erect, 

 variable; mesosternal lobes separated by an interval which is subquad- 

 rate but a little transverse and nearly as broad as the lobes in the 

 male, strongly transverse and broader than the lobes in the female, the 

 metasternal lobes subapproximate in both sexes. Tegmina elliptical, 

 not wholly lateral, shorter than the pronotum. Fore and middle femora 

 tumid in the male, the hind femora moderate, compressed, the hind 

 tibiae with 9-11 spines in the outer series. Extremity of the male 

 abdomen upturned and slightly enlarged, the subgenital plate strongly 

 produced and elongate, its lateral margins feebly convex, meeting api- 

 cally at an acute angle which is provided with a slight tubercle and is 

 removed at a long distance from the tip of the supraanal plate; furcula 

 developed slightly or moderately; cerci very long and very slender, 

 laminate, directed inward apically. 



Two species are known, coining from Mexico, Central America, and 

 northern South America. 



ANALYTICAL KEY TO THE SPECIES OF PARADICHKOPLUS. 



Prosternal spine quadrate, appressed, truncate ; posterior margin of pronotum feebly 

 emarginate; inner edges of tegmiiia separated by half tbo width of tbe pronotum; 



furcula well developed 1. tnexicanus (p. 19). 



Prosternal spine conical; posterior margin of pronotum entire; inner edges of 

 tegmina subattiugeut ; furcula very slight 2. raricolor (p. 21). 



i. PARADICHROPLUS MEXICANUS. 

 (Plate II, figs. 4, 5.) 



Platyphyma mexicanum BRUNNER, Verhandl. Zool.-Bot. Gesellsch. Wien, 1861 



(1861), p. 224; Orth. Stud. (1861), p. 4. WALKER, Cat. Derm. Salt. Brit. 



Mus., Suppl., V (1871), p. 71. THOMAS, Rep. U. S. Geol. Surv. Terr., V (1873), 



p. 224. 

 Caloptenns mexicanus WALKER, Cat. Derm. Salt. Brit. Mas., IV (1870), pp. 682- 



683. THOMAS, Kep. U. S. Geol. Surv. Terr., V (1873), p. 227. 

 Paradicliroplus mexicanus BRUNNKR, Rev. Syst. Orth. (1893), p. 145. 



Blackish fuscous above with a strong ferruginous tinge, dull flavous 

 below. Head with tumescent genae plumbeous or livid, more or less 

 heavily mottled with ferrugiueo-fuscous, the summit wholly blackish 

 fuscous, separated from a broad blackish fuscous band behind the eyes 

 by a lighter but obscure stripe behind the upper part of the eyes; 

 frontal costa rather prominent above, especially in the male, punctate, 



