iDu; 



NATURAL SCIEN'CES OF PlIILADELPIIIA. 



307 



ever, the form of the male cerci is the one character which will enable 

 the student to recognize the two types with certainty 

 and celerity. Redtenbacher's description says, "Cerci 

 male subacuminati, vix compressi," and this clearly 

 applies to the form for which his name is here used, (). 

 molossum having the cerci depressed and not even slightly 

 compressed. The cercus of 0. nitidum is very slightly 

 compressed in the distal half with a slight dorsal keel, 

 and a figure is here given to fix the species with cer- 

 tainty. Cereal and ovipositor peculiarities are unques- 

 tionably among the chief characters to be used in 

 separating the species of Orchelimum. 



Measurements of the specimen, of which a cercus is 

 figured, are as follows: 



Fig. li.-Orchel- 

 imum niti- 

 dum R e ci- 

 te nbacher. 

 Dorsal \^ew 

 of apex of 

 male abdo- 

 men. (X 4.) 



Length of body 22.5 mm. 



Length of pronotum, 5.8 " 



Length of tegmen, 23.5 " 



Length of caudal femur, 20.2 " 



The range of this species now includes Georgia and Florida. 

 Orchelimum molossum n. sp. 



Tj^pcs : o^ ; Pablo Beach, Duval County, Fla., August 13, 1905. Q ; 

 Gainesville, Alachua Co., Fla., August 16, 1905. (Hebard 

 and Rehn.) 



Closely allied to 0. nitidum, but differing in the slightly 

 heavier fastigium, the smaller pronotum with narrowt r 

 lateral lobes, the smaller and more delicate tympanum 

 of the male tegmina, the smaller, slightly depressed cerci, 

 which have the tooth about median, and the slightly 

 deeper emargination of the subgenital plate of the male. 



Size moderately large (for the germs); form rather 

 slender. Head rather broad; fastigium moderately 

 broad, slightly elevated and rounded dorso-ventrad. 

 apex more rounded transversely in the male than in the 

 female, a fine median longitudinal depression present 

 on the apex in both sexes, ventral portion narrowed and 

 in contact with the fastigium of the face; eyes rather 

 large, moderately prominent; antennae extremely long, 

 Pronotum with the dorsum flattened, caudal transverse 

 sulcus impressed; cephalic margin of the disk sub- 

 truncate, caudal margin arcuate, lateral angles distinct 

 only on the caudal lobe and there well rounded; lateral 



Fig. A.-Orchel- 

 irmim molos- 

 sum n. sp. 

 Dorsal view 

 of head, pro- 

 notum and 

 tympanum 

 of male type. 

 ( X 3.) • 



