110 FAMILY II. BLATTIDJB. THE COCKROACHES. 



vaga apacha Sauss., stating: "I cannot be absolutely positive of 

 this determination without removing the subgenital plate. Do 

 you remember definitely getting this specimen in Florida? I 

 cannot believe it ever came from there, but if it did it must have 

 come in on some train from the western desert. This insect is 

 not a native of Florida." It was then sent to Caudell who re- 

 plied that it was an Aremvnga allied to apaclia, and perhaps a 

 new species, adding: "Could you by any means have made an 

 error in labelling this specimen? It should be from Texas or 

 farther west." Soon afterward he received two females from a 

 Florida correspondent, and described the species as new, my Dune- 

 din male thus serving as the type of the only species of the sub- 

 family known east of the Mississippi. The facts as above given 

 are mentioned only to show that in the study of sjicli mobile 

 forms of life as insects it is not safe to conclude that any genus 

 or even species is confined to a definite region, and that one may 

 hunt over a well known area for years and yet not discover a form 

 which may be brought to light by some future collector. 



39. ARENIVAGA FLORIDENSIS Caudell, 1918b, 156. Florida Sand Roach. 



Male Broadly oval, much less elongate than in any other member of 

 the genus. General color fuliginous or dark smoky brown; pronotum with 

 a large, reniform central piceous blotch, front and side margins broadly 

 pale transparent yellowish, basal fourth fuscous enclosing two yellowish 

 dots; tegmina smoky brown, the humeral angle paler; face, under surface 

 and legs pale brownish yellow. "The sinistral concealed plate and the 

 genital hook are about as in A. erratica but the inferior dextral plate is 

 more regular in shape than in that species, though agreeing with it in be- 

 ing unarmed; the superior dextral plate is shaped as in erratica and allies 

 but instead of being armed at the base of the inner excavation with a 

 sharp spine as in erratica and apaclia it is there furnished with an ele- 

 vated rounded ridge which, from an apical view, looks like a rounded sub- 

 clavate projection, similar to that of genitalis, but from a lateral view ap- 

 pears to be the terminus of an elongate elevated ridge." (Caudell.) 



Female Broadly oval widest about the middle. "Color almost black, 

 the limbs and lower surface partially lighter; pronotum with disk bor- 

 dered some.what broadly on the anterior and lateral margins with reddish- 

 yellow, the nieso- and metanotum similarly margined laterally; segments 

 of abdomen each marked laterally with a black spot, with usually some 

 lighter lateral areas wholly or partially surrounding these black lateral 

 spots." Length of body, $, 13; of pronotum, $, 4.2 4.5; $, 5; of teg- 

 mina, $, 13.5 15 mm. Width of pronotum, $, 6 6.5, 9, 8; of metano 

 turn, 9, 11; of tegmina, $, 10 11 mm. 



Known only from Dunedin, Lakeland and Auburndale, Fla. 

 Two males have been taken by me at Dunedin, one (Type No. 21, 



