ACRIDID/E. 651 



wiih two smooth calli on each side and with distinct transverse impressed 

 lines; fore border, sides and hind border rounded. Proslernal spine 

 slender, acute, slightly compressed. Hind femora much longer than the 

 abdomen; hind tibiae much shorter than the hind femora. Fore wiugs 

 narrow, a little shorter than the body. 



1. SVNTOMACEIS VITTIPENNIS. 



Mas. Testacea ; vertex nigricante bistrigalus ; frons piceo hivitlala ; 

 palpi pullide virides; anlennce rufce, basi nigricantes ; prolhorax 

 nigra triviltalus ; abdomen piceo univitlatum ; pedes nigri, femoribus 

 poslicis lestaceis apice nigris, tarsis pallide viridibus ; alee anticee 

 nigricantes, testaceo bivittata: ; ala poslicce cinerea, fusco mar- 

 ginalce. 



Male. Testaceous. Vertex with two blackish streaks, wiiich are 

 united iu front; front with two piceous stripes. Palpi pale green. Eyes 

 lurid. AnlenuEe very bright red, blackish at the base. Prothorax with 

 three black stripes. Abdomen with a piceous stripe. Legs black; hind 

 femora testaceous, black towards the tips; tarsi pale green. Fore wings 

 blackish, with two pale testaceous lanceolate stripes. Hind wings cine- 

 reous, brown along the border; veins black. Length of the body 7^ lines ; 

 expansion of the fore wings \5 lines. 



a. Nauta, Amazon Region. From M. Degand's collection. 



Genus 23. STENACRIS. 



Mas. Corpus gracillimum, fere cylindricum. Caput longum; f.isti- 

 gium conicum ; frons valde retracia, carinis quatuor bene determiuatis. 

 Oculi obliqui, subprominuli. Antennae filiformes, gracillima-, prothorace 

 longiores. Prolhorax subtiliter puuctatus, non carinatus ; margines sub- 

 rotundati. Prosterni spina robusta, oidiqua, apice rolundata, mesosternuni 

 non attingens. Abdomen compressum, lanceolatura. Alae anticue angustae, 

 corpore vix breviores. 



Male. Body shining, very slender, nearly cylindrical. Head elon- 

 gate, smooth, with a Irausverse furrow between the eyes ; tip of the vertex 

 conical; front much retracted, with four distinct keels; inner keels 

 parallel, approximate; outer keels diverging towards the face. Eyes 

 oblique, elongate-elliptical, slightly prominent. Antennae filiform, very 

 slender, longer than the prothorax. Prothorax finely punctured, not 

 keeled; transverse impressed lines slight; fore border, sides and hind 

 border slightly rounded. Prosternal spine stout, oblique, rounded at the 

 tip, not extending to the mesusternum. Abdomen compressed, lanceolate. 

 Hind femora as long as the abdomen ; hind tibiae much shorter than the 

 hind femora. Fore wings narrow, nearly as long us the body. 



I. SxENACRIS LANCEOLATA. 



Mas. Pallide testacea; antenna picecB, basi testacea; abdomen vitia 

 dorsali nigricante lanceolata; tarsi postici pallide rnft ; ala aniicie 

 dimidio apiiali diaphana. 



