72 PROF. p. E. UnLER — ENUMERATION OP THE [.Tan. 15, 



Length to tip of abdomen 5-6 mm. ; expanse of wing-covers 

 15-16 mm. 



Ten specimens were collected at various localities on the island. 



This is an exceedingly variable species as regards colour and 

 pattern of marking. One specimen is mostly white, with a band 

 of fuliginous on the apex of the wing-covers. Between this and 

 the variety with a large triangular dark spot on the apical half 

 of the pale tawny wing-covers there is a series of several degrees 

 of expanse of the dark colour. The wmgs vary from pure white 

 to dark lead-colour. I do not find any important differences to 

 separate this from a species which is quite common in northern 

 Mexico, Arizona, Texas, and California, and which approaches 

 0. mesocJiIorus, Walker, from Cuba ; but this latter has broader 

 wing-covers and a longer, more prominent vertex. 



ScARPOSA, gen. nov. 

 Eobust, wing-covers decumbent, nearly twice as long as wide, 

 broadly arcuate from base to behiud the middle, then sinuated 

 and narrower to the apex. Head viewed from above wider tlian 

 long, the vertex with an excavation which widens anteriorly, 

 each side of this is an indentation bounded exteriorly by the 

 arched carinate margin ; cheeks nearly flat, extended widely in 

 front of and below the eyes, grooved above next the reflexed 

 margin, callous next below ; front subtrapezoidal, barely wider 

 than long, longitudinally tumid each side, impressed in the middle, 

 grooved against the raised lateral margins, a little sinuated above, 

 with a narrow callosity at the summit ; clypeus long, acutely 

 tapering, the margins reflexed. Eyes small, globular, prominent. 

 Antennae short, bluntly rounded at base. Pronotum semicircular, 

 but little longer than the vertex, sinuated at base, with the lateral 

 flap triangularly produced against the eye. Mesouotum wide, 

 a little \Aider than long, almost flat, the anterior margin bluntly 

 triangular; the sides rectangularly triangular, and posteriorly 

 longer, more converging, and forming a triangle with the short 

 scutellum ; the middle line obsoletely carinate, and the margins of 

 the disk thick and set with two callous knobs. Basal margin of 

 clavus convexly inflated, with the submargin carinately crested, 

 and together with the inner margin forming an arch, the clavus 

 behind this tapering narrowly back to the base of the membrane, 

 the surface more or less granulated to near the tiji ; corium ^\ath 

 wide and long areas which are crossed by mostly indistinct 

 reticulations behind the middle, but with distinct oblique and 

 irregular veins beyond the middle of the postcostal area, veins of 

 the wide costal area numerous and moderately oblique, almost the 

 entire surface spruikled with callous granules ; veins of the sub- 

 quadrangular membrane curving in various directions and forming 

 crowded and irregular cells, the apical series composed of sub- 

 quadrangular areoles of larger size which are narrower above the 

 middle. Posterior tibise grooved, armed with two stout spines 

 below the middle. Abdomen blunt, subconical. 



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