256 ORTHOPTEKA. 



[2. Arnilia vitreipennis, Marschall. 



Gryllus vitreipennis, Marsch. Ann. Wien. Mns. i. pp. 214-215, t. 18. fig. 6 (1836) \ 

 Stenacris chlorizans, Walk. Cat. Dermapt. Salt. Brit. Mus. iv. pp. 652, 653 (1870) a . 

 Arnilia chlorizans, Scudd. Proc. Bost. Soc. Nat. Hist. xix. p. 88 (1877) 3 ; Cat. Orthopt. U.S. p. 46 



(1900) \ 

 Arnilia cylindrodes, Stal, Recens. Orthopt. i. p. 85 (1873) (in part.) 5 ; Scudd. Cat. Orthopt. U.S. 



p. 46 (1900) 6 . 



Hdb. Noeth America, South-eastern States 1-6 . 



This insect seems to be restricted to the Southern Atlantic and Gulf States of North 

 America, where it occurs in swampy or wet localities. It was undoubtedly the male 

 of the Carolina species that Stal had before him when he drew up his description of 

 the subgenital plate of this sex : " segmento genitali maris longo, producto, pone 

 medium utrinque lobo sat longo dentiformi armato, parti apicali pone illos lobos 

 producta, angusta, superne excavata " (Recens. Orthopt. i. p. 42). South- American 

 specimens of at least three species examined by me lack the lateral teeth. The Rio 

 Janeiro and Carolina individuals certainly represent two distinct forms.] 



3. Arnilia marschalli, sp. n. 



An insect of medium size and robustness, in which, the sides of the head, lower lateral margins of the pro- 

 notum, and the pleura are quite conspicuously banded with dirty white or pale testaceous, and in which 

 the dorsum of the abdomen is dull plumbeous. 



Head of about the same width as the front edge of the cylindrical or subcylindrical pronotum ; the occiput a 

 little longer than the hind lobe of the pronotum ; fastigium of the vertex in the male very slightly 

 acuminate, in the female gently obtuse, rather rugosely punctate and without a perceptible sulcus. Eyes 

 normal, separated above by a space equal to ( $ ), or slightly less than ( £ ), the width of the frontal costa 

 between the antennae. Frontal costa continuous, rather profoundly sulcate. Antennae filiform, or with 

 the basal joints very greatly depressed, in the female about as long as, and in the male a little longer than, 

 the head and pronotum together. Pronotum very gently but broadly constricted at sides, the surface 

 above closely punctate, at sides less densely so, except on the hind lobe, the transverse sulci strongly 

 impressed. Tegmina and wings rather narrow, a little surpassing the tip of the abdomen and hind 

 femora ; the former less sparsely veined on the basal third than are those of vitreipennis, Marschall, from 

 the Southern United States. Hind femora nearly or quite reaching the apex of the abdomen ; the hind 

 tibiae slender, seven-spined externally. Last ventral segment of the male abdomen as described in the 

 synoptic table. The supra-anal plate also as there mentioned. Prosternal spine straight, equal, a little 

 more than twice as long as its diameter, gently directed to the rear. 



General colour pale green, inclining to flavous below. Sides of the head, lower margin of the sides of 

 pronotum and the pleura marked by a conspicuous longitudinal pale band which is bordered above by one 

 of dull piceous. Dorsal portion of the tegmina, disk of the pronotum, and the occiput tinged more or less 

 strongly with ferruginous. Wings basally bluish-grey, smoky apically. Antennae ferruginous. Tip of 

 the hind tibiae and their tarsi tinged with red. 



Length of body, <y 25, $ 29 ; of antennae, 6 9, $ 8 ; of pronotum, <$ 4-1, $ 5 ; of tegmina, d 20, $ 25 ; 

 of hind femora, d" 13, $ 16 millim. 



Hab. Costa Rica, Juan Vinas (L. Bruner, M. A. Carriker, M. Carey), Port Limon 

 (M. A. Carriker). 



This insect was found to be very common in March about the borders of a swamp 



