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XYSTOSOMTJS.— BEMB1DIUM 



147 





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3. Xystosomus belti. (Tab. VI. fig. 8.) 



Xystosomus belti, Bates, Proc. Zool. Soc. 1878, p. 601 l . 

 Xystosomus olivaceus, Bates, loc. cit. p. 601 2 . 



" Elongato-ovatus, modice convexus, politus, viridi-ameus, elytris aureo tinetis ; antennis fulvis, pedibus rufo- 

 piceis, corpore subtus piceo ; foveis frontalibus longis, ab sulculo oculari utrinque carina separatis ; oculis 

 maximis ; thorace transverso, antice prope angulos fortiter rotundato-angustato, postice haud angustato, 

 angulis posticis rectis ; elytris striis punctulatis novem, l a -3 m vix impressis (l a versus apicem excepta), 





4 a -7 



m 



apice evanescentibus." 



Lous:. 13-21 lin. 





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Hab. Mexico, Cordova (Salle) ; Guatemala, San Geronimo (Champion 



NlCAEAGUA 



Chontales (Belt 1 2 , Janson) ; Panama, Volcan de Chiriqui, 2000 to 4000 feet, Bngaba 



( Champion 



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The sen 



lpt 



of th 



lyt 



varies a little in 



pth 



Mexican and Guatemalan 



specimens have the striee most faintly impressed ; those from Chiriqui have mostly deep 



striae with 



th 



strise always the feeblest 



k 



the legs is most frequently (especially in Chiriqui examples) confined to the middle 



Ih 



of the tibiae, and then often on the fore legs only. 



X. olivaceus (Bates) is evidently only a colour-aberration 



example described. 



BEMBIDIUM. 



Bembidium, Latreille, Hist. Nat. Ins. viii. p. 221. 



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Nearly 500 species have been described of this well-known g 



the 







It is especially 



characteristic of temperate and boreal climates, being but sparingly represented in the 

 tropics, even at high elevations ; and in the river-plains of equatorial countries, as, for 



example, the Amazons 



entirely absent, the allied 



Tachys, Pericomp 

 It should be remarked 





and Xystosomus, in numerous species, there taking its place. 



however, that the true functional representatives of the Bembidia in moist localities of 



the equatorial regions of America are the Lachnophorinse. 





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1. Bembidium sphseroderum. (Tab. VI. fig. l 



PhUochtho arneo subsimilis. Oblongum, subdepressum, olivaceo- vel cyaneo-nigrum, politum, antennarum 

 articulis 3-4 basalibus pedibusque rufo-testaceis ; capite lato, sulculo frontah usque ad ocuh margmem 

 posteriorem ducto ; thorace valde rotundato, transverso, prope basin citius usque ad pedunculum rotun- 

 dato-angustato (margine obtusissime angulato nee sinuato), anguste explanato-reflexo, basi lsevi, fovea 

 utrinque parva rotundata ; elytris thorace vis latioribus, utrinque striis punctatis sex, omnibus (suturah 

 excepta) ante apicem terminatis, area apicali politissima, stria tertia bipunctata, margine basalx usque 

 ad strise 5 s basin curvato sed a striis distante. 





►bscurioribus 



Long;, li lin. 



Hab. Mexico, Jalapa (Edge). 



The dark-legged variety, of which only one example was taken by Herr H 



is 



from Oaxaca 



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