170 FAMILY V. TETRIGID.E. THE GROUSE LOCUSTS. 



Synonyms of this variety or of typical arenosum are Tettix an- 

 gustus Hancock (1896, 238), which he later placed (1902, 89) "as 

 a variety which merges into arenosum on the one side and obscu- 

 rum on the other"; T. gibbosa Hancock, which was considered by 

 me (1903, 225) as "only a shorter and wider form of arenosum 

 having the pronotum a little more constricted than usual in front 

 of the shoulders" ; and T. inf lotus, deooratus and fluctuosus Han- 

 cock, which have since been stated by their author (1902, 90) to 

 be synonyms. Eehn (19041, 326) says that "the separation of 

 obscurum, arenosum and gibbosum is a task which is practically 

 hopeless. There is some evidence in retaining obscurum as a geo- 

 graphic race of arenosum, but gibbosum is inseparable from 06- 

 scurum." In their latest paper treating of the Tetrigidae (1916, 

 134) R. & H. have retained obscurum as a geographic race, but 

 have (wrongfully, I think) replaced the name with angustum, 

 which Hancock, as above quoted, says is an intermediate form be- 

 tween arenosum and obscurum, and as such has no standing. 



G9b. ACKYDIUM AKENOSUM BLATCHLEYi (Hancock), 1902, 91. Blatchley's 

 Grouse Locust. 



A very slender southern form of arenosum from which it is distinguished 

 by having the pronotum and femora more rugose-tuberculate, the lateral 

 carinse of pronotum more decidedly compressed and its dorsal surface be- 

 hind the shoulders strongly compressed or narrowed. The frontal costa, 

 viewed in profile, is distinctly advanced beyond the eyes and strongly 

 sinuate between their lower portions. Pronotum usually attenuate and 

 distinctly surpassing the tips of hind femora but sometimes much shorter, 

 more acute and surpassing the femora only .5 mm.; lower sinus of lateral 

 lobes much narrower and deeper than in arenosum. Tegmina oblong-oval, 

 their tips obtusely angulate. Wings slightly shorter or subequal in length 

 to pronotum. Hind femora with numerous strong oblique ridges on outer 

 face. Antennae and tibia? annulate. Length of body, $ , 9 9.5, 9 , 

 9 11.5; of pronotum, $, 8 8.5, 9, 8.G 10.7; of hind femora, $ and 9. 

 5 5.3 mm. 



Ormond, Fla., Apr. 9, 1899 (type) ; Dunedin, Fla., Jan. 22- 

 Apr. 1; LaBelle, Fla., Feb. 25 (W. fi. B.}. Deep Lake, Fla., Apr. 

 13 (R. & H., 1914d). The above are the only known stations of 

 this grouse locust. At Dunedin specimens have been taken on sev- 

 eral occasions by sweeping a recently cleared space along the mar- 

 gins of a garden which occupies a large tract of rich soil on the 

 former side of a wet hammock, and is still in great part surround- 

 ed by a dense hammock growth. Only two or three individuals 

 were taken at a time. The sweeping yielded also Tettigidca later- 



