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SPHENOPHOliUS. 



163 









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The numerous examples received of S. sidcifrons, mostly from Vera Cruz, represent 

 two forms: — one (agreeing with the type) bare, shining, with numerous punctures 

 along the elytral striae, and the hairs on the legs partly or entirely wanting ; the other 



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opaque 









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(even when cleaned with caustic potash), more or less incrustate, with fewer 

 punctures along the elytral striae, and the femora and tibia? conspicuously ciliate. 

 These forms have been received from the same locality and there can be no doubt 

 that they belong to one and the same species. It has the rostrum stout, compressed, 

 and moderately long, sharply dilated at the apex (as seen in profile), and the widened 



basal portion deeply sulcate 



parsely, coarsely 5 unequally punctate ; the 



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elytra with coarse, rounded, foveiform punctures placed along the narrow striae, and 

 the interstices somewhat coarsely uniseriate-punctate ; the pygidium very coarsely 



— 



L L X L L L 



femora 





punctured, tumid down the middle, and hollowed on each side ; the 



more or less ciliate in both sexes ; and the anterior tibiae not produced at the outer 





pical angle. The tumid pygidium 



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S. sulci fi 



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from S. callosus (Oliv.), and S. destructor and S. suhlwvis, Chittend., the last-m 

 insect corresponding with the denuded examples of the present species. 





14. Sphenophorus memnonius 



Svhenophorus memnonius, Gyll. in Schonh. Gen. Cure. iv. p. 935 x ; Chevr. Ann. Soc. Ent. Fr. 



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1885, p. 109 



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Sphenophorus simplex , Lee. Proc. Acad. Phil. 1859, p. 79 3 ; Horn, Proc. Am. Phil. Soc. xiii. 



p. 412 



4 



Wash. vi. pp. 128, 130 (1904) 





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<3\ Pygidium with a small tuft of hairs on each side at the tip. Ventral excavation very long and deep, the 



fifth segment unimpressed as in the $ . 

 Length 7§-ll, breadth 24-4^ millim. ( rf $ .) 



Hub. North America, California 34 , Utah 3 5 .— Mexico 1 2 {Truqui, Mus. Brit), 

 Guanajuato (Salle), Mexico city (Edge, Wickham), ' Guadalupe, Distrito Federal 

 ( Wickham), Yucatan (Mus. Brit.). 



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Var. The rostrum distinctly sulcate at the base ; the elytra with broader and more coarsely punctured striae, 

 and the interstices in great part uniseriate-punctate ; the under surface more coarsely punctate, the fifth 



ventral segment especially. ( 6 $ •) 



Bob. Mexico, Aguas Calientes city (Edge), Durango city ( Wickham). 



This is one of several Mexican forms related to the N.-American S. vomerinus, 

 Lee. It has a rather short, stout, compressed, apically widened rostrum (as seen in 

 profile), with the widened basal portion closely punctate, and finely sulcate; the 

 prothorax closely punctate, except along a narrow space down the middle, and without 

 trace of a more coarsely punctured V-shaped area at the base ; the scutellum long, 

 narrow, and faintly sulcate ; the elytra narrowly, deeply, and rather coarsely punctate- 

 striate, with the alternate interstices irregularly bi-, and the others uni-, seriately 

 punctured (the punctures sometimes very fine) ; the anterior and intermediate femora 





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