156 PROC. ENT. SOC. WASH., VOL. 20, NO. 7, OCT., 1918 



Measurements. Male (type): length, pronotum, 3.6 mm.; tegmina, 13 

 mm.; width, pronotum, 5 mm.; tegmina, 5 mm. 



Paratypes a, b and c are practically the same size as the type 

 but paratype d is somewhat larger, measuring as follows: length, 

 pronotum, 3.8 mm.; elytra, 14.5 mm.; width, pronotum, 6 mm.; 

 elytra, 6 mm. 



Type. Phoenix, Arizona, v-17, R. E. Kunze, coll.; paratype 

 a, same locality and collector, date iv-15; paratype b, same, date, 

 viii-5; paratypfe c, Higley, Arizona, June 18, 1917, E. G. Holt, 

 collector, at light; paratype d, Catal. Spgs., Arizona, 7-4. 



All material . in Coll. U. S. Nat. Museum. Catalogue No. 

 21879. U. S. N. M. 



Arenivaga floridensis n. sp. 



Male. In color the species is similar to an intensively colored apacha, 

 nearly as blackish as the variety infuscata of that species, but the genital 

 structure is more like that of erratica. The sinistral concealed plate and 

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

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

 being 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 apacha it is there furnished with an elevated rounded 

 ridge which, from an apical view, looks like a rounded subclavate projec- 

 tion, similar to that of genitalis described above, but from a lateral view 

 appears to be the terminus of an elongate elevated ridge; the exact nature 

 of this character and the structure further in behind it cannot be made 

 out without complete dissection, which does not seem advisable with the 

 unique male specimen. The interocular space is barely narrower than the 

 interocellar space. The general color, as stated above, is very dark; the 

 shield-shaped maculation on the pronotal disk is distinct and well defined, 

 separated from the anterior and lateral edges of the disk by a wide yellow- 

 ish margin and from the posterior edge by a narrow, partly infuscated 

 margin. The general shape is decidedly less elongate than in any other 

 member of the genus. 



Female. Shaped about as in apacha as figured by Hebard, 2 but the 

 broadest part is more nearly the middle of the insect. Color almost black, 

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

 dered somewhat broadly on the anterior and lateral margins with reddish 

 yellow and in the allotype the meso- and metanotum are similarly margined 

 laterally: the segments of the abdomen are marked laterally with a black 

 spot as in erratica and in the allotype there are also some lighter lateral 

 areas wholly or partially surrounding these black lateral spots. 



f 

 2 Mem. Amer. Ent. Soc., No. 2, pi. ix, fig. 16 (1917). 



