110 1124. liEVJSjOS OF THE MKlAynPU—SCrDDEK. 151 



])roii<»tiiin toj^t'tlier, sublanceolate, subjicuiniiiate, browiiisli fiwcous, tlio 

 discoidiil area sometimes with fet'bly aiteniatin^ darker and li<;hter 

 dashes. Hind femora externally varyinj; from fuseo-oliva<'eous to fuseo- 

 testaceoua, tlie lower and inner fa«'es tiavous, the latter as well as the 

 inner half of the upper fare barred at base and before and beyond the 

 middle with fuseoiisor blaekiah fuseous, the outer half of the upper fa<*e 

 more or less infuseated throughout, the genicular arc black; hind tibiae 

 red, the spines black only on their apical half, eleven or twelve in nund)er 

 in the outer series. Kxtremityof male abdomen slightly clavate, much 

 upturned, the supraanal plate triangular with straight sides and acute 

 apex, the rather broad, deep, median sulcus bounded by very high, 

 sharp walls; furcula consisting of a pair of minute, acuto denticuUi 

 tions overlying the ridges of the supraanal i>late; cerci broad, arcuate, 

 especially by the curvature of the lower margin, tapering only in the 

 apical half, well rounded apically, much less than twice as long as 

 broad, but nearly as long as the supraanal plate, hardly incurved, the 

 apical portion feebly sulcate exteriorly ; infracercal plates large, basfilly 

 nearly as broad as the cerci, rapidly narrowing and extending slightly 

 beyond the supraanal plate; subgenital jdate broad and rather short, 

 the lateral margins straight, apically acutely rounded, neither ])rol()nged 

 nor elevated. 



Length of body, male, 14 mm., female, 20 mm.; antennae, male, 0.5 

 mm., female, 7.5 mm.; tegmina, male, 5 mm., female, 8.25 mm.; hind 

 femora, male, \) mm., female, 11 mm. 



Two males, 1 female. Colorado, 5,500 feet, Morrison (S. Henshawj 

 S. H. Scudder). 



g. MELANOPLUS RILEYANUS mew species). 



(Plate X, ««?. 9.) 

 Pezotettix rileyanus McNeill!, MS. 



T>ark brownish testaceous, with a broad, lateral piceous stripe. Head 

 rather prominent, dark testaceous, sometimes with a feeble olivaceous 

 tinge, much Hecked and punctate with fuscous, above much infus- 

 eated; vertex somewhat tumid, distinctly elevated above the pronotum, 

 the interspace between the eyes rather narrow^, narrower than the tirst 

 antenna] joint (male) or rather broad, distinctly broader than that joint 

 (female), the fastigium with slight, raised, rounded ridges next the eyes, 

 but otherwise scarcely sulcate (female) or distinctly sulcate throughout 

 (male) ; frontal costa moderately broad, fully as broad as (male) or rather 

 narrower than (female) the interspace between the eyes, subecpial, 

 strongly punctate throughout, feebly sulcate at and below the ocellus; 

 eyes large and moderately prominent, distinctly longer than the infra- 

 ocular portion of the genae; antennae luteo testaceous, nearly (male) or 

 but little more than half (female) as long as the hind femora. Pronotum 



