392 Dr. J. L. Hancock's Further Studies of 



Genus Holoarcus, nov. 



Resembling Pie'^otettix, but differing in having all the margins of 

 the pronotal crest entire and arcuate, the summit sulcate, in the 

 almost obsolete lateral carina^, in the acute angled apex of posterior 

 process, and the strongly dilated hind femora bearing denticulate 

 margins. 



Including the type ai^!moi!?^s herewith described, Pic^o^e^- 

 tix arcuat%ts, Haan, and Piezotettix sulcatus, Stfil. 



1. H. altmotv.% sp. nov. (Plate XXII, fig. 2.) 



Allied to arcnatns, Haan. Body ochreous-ferruginous ; vertex 

 wide, about twice the width of one of the eye?, elevated considerably 

 higher than the eyes, tumid, with minute vestigial carinuke on each 

 side next to the apices'of the conoidal eyes ; frontal scutellum trian- 

 gular and open below, very slightly arcuate between the anteim;e ; 

 the antenn.-e short filiform, as long as the face from vertex to 

 clypeate margin below, inserted barely below the eyes; posterior 

 ocelli placed distinctly in advance and little below the middle of 

 the eyes; maxillary palpi having the last articles dilated, hirsute. 

 Pronotum strongly compresso-foliaceous, the whole crest punctate- 

 translucent when held against the light; anteriorly advanced over 

 and beyond the head, the dorsal margin of crest presenting a highly 

 arcuate outline in profile but little depressed forward above the 

 lateral lobes, the summit sulcate, posteriorly the crest more sloping 

 than in front, the apex acute angulate and extending backwards 

 nearly to the apices of the posterior femora ; sides of pronotum 

 little rugose bearing light radiating reticulations ; the lateral carinte 

 very little expressed. Superior margins of anterior femora entire, 

 the inferior lightly bidentate ; middle femora elongate, margins 

 subentire ; posterior femora strongly dilated, the superior margin 

 stronaly arcuate, from the middle backward tridentate, the ante- 

 genicular and genicular lobes acute, the external pagina above longi- 

 tudinally nodulose, bearing oblique rug* forward between the 

 carinte but scabrous and interrupted distally ; hind tibioc rather 

 stout, the margins armed with ten or eleven valid spines, the inner 

 mar<dn havin- about six or seven spines ; first articles of the posterior 

 tarsi^elongate,' the third pul villi distinctly longer than the second. 

 Valves ofthe female ovipositor having the superior glades constricted 

 at the middle, slender and denticulate. 



Entire length of body, female (same as pronotum), 13-5 mm. ; 

 posterior femora 9 mm. ; width 3-5 mm. 



