400 PROCEEDINGS OF THE ACADEMY OF [May, 



Microcentrum rostratum R. and H. 



Key West, Fla., July 3-7, 1912; 10 c^, 1 cf n. 



Long Key, Fla., July 13, 1912; 1 cf n., 1 9 n. 



This striking and peculiar species was taken in but one location 

 on Key West, and there it was found at night locally numerous but 

 hard to secure. Individuals were taken only on buttonwood (Cono- 

 carpus erecta) on the two occasions on which the spot was visited. 

 All the specimens were stalked with flash-lamp by the aid of their 

 song, in consequence none but males being captured. Their note is 

 quite different from that of any of the other species of the family 

 found on the keys, being low and rasping, much like zrrrp-zrrrp, 

 zrrrp. On Long Key the nymphs were taken from buttonwood {Cono- 

 carpus erecta), which there grows on the edge of mangrove swamps. 



As the species was previously known only from the unique type, a 

 female, we have made some notes on the differences of that sex from 

 the original description. ^^ 



Allotype: & ; Key West, Florida. July 3-7, 1912. (Rehn and 

 Hebard.) [Hebard Collection.] 



Fastigium slightly more compressed than in the female, but other- 

 wise similar. Tympanum of tegmina half again as long as the disk 

 of the pronotum, stridulating vein broad, depressed, arcuate, slightly 

 obliciue. Disto-dorsal abdominal segment arcuato-truncate mesad, 

 with a medio-longitudinal depression; supra-anal plate trigonal, 

 with a deep median sulcation; cerci tapering, nearly straight, con- 

 sideral)ly surpassing the distal margin of the subgenital plate, the 

 apex blunted and slightly hooked dorsad, furnished dorsad with a 

 pair of teeth placed side by side and with a single tooth placed ventrad 

 of the same; subgenital plate ample, narrowing distad, lateral 

 margins slightly arcuate but subregularly converging, distal extremity 

 narrow, arcuato-emarginate, styles articulate, slightly tapering, their 

 length not greater than the width of the distal extremity of the plate. 



Measurements {in millimeters) . 



Allotype, cf. 



Length of body : I 20 . 8 



Length of pronotum 5 . 3 



Caudal width of the disk of the pronotum 4 . 1 



Length of tegmen 28 . 8 



Greatest width of tegmen 7.5 



Length of caudal femur 15 .6 



Length of caudal tibia 16 .8 



2^ By an unfortunate transjiosition, the original description states that the 

 lateral angles of the pronotal disk are "more apparent cephalad than caudad," 

 when the reverse is true of the type and the present material. (Proc. Acad. 

 Nat. 8ci. Phila., 1905, p. 4.3.) 



