











ONYPTEETGIA.— DIPLOH AEPUS . 



133 



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16. Ony pterygia pusilla. 



• 





Onypterygia pusilla, Chaudoir, Ann. Soc. Ent. Ft. 1878, p. 276. 



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Hab. Mexico, Cordova, Juquila {Salle), Jalapa (Hoge); Guatemala, Senahu 

 {Champion). 



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Subfam. PERIGONIN^l. 

















Since this subfamily was proposed, under the name Trechichinse, in the " Geodephag 

 Coleoptera of Japan " (Trans. Ent. Soc. 1873), M. Putzeys discovered that the ge: 













Perigona, described by Castelnau as far back as 1835, belongs to the group, and i\ 

 synonymous with, or at least very closely allied to, Trechieus, proposed long afterwards 













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Further examination has convinced me that Diploharjms, Chaud., also belongs to the 



subfamily 



the genus Mizotrechus, described by me in 1872 (Ent. Monthly 



Mag. viii. p. 199). The last-mentioned genus, however, must be restricted to the typical 





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species M. novemstriatus, the remainder being referable to Perigona. 



Dr. Horn, in his recent work on the Carabidse, places the subfamily as a subordinate 

 group under the Platyni (= Anchomeninse) ; but I think it is clear we have here to 













deal with a modification of the Carabideous type quite distinct from the Platyn 

 total absence of subapical sinuation in the margins of the elytra, the peculiar si 



The 









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in which the eighth stria is more deeply impressed than the rest and is continuous to the 

 apex, the paraglossse adherent (although only by a thin membrane) to the upper angles 



of the ligula, the partial pub 



of the third (and sometimes the second) joint of 



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the antennae, and the gradually pointed terminal joint of the palpi, form a combination 

 of characters quite unlike those of the Anchomeninee. Some features of their structure 











point 



group Bipalmati ; and the peculiar striation seems to indicate an 

























affinity with the Stenolophinae, certain Australian 



Acupalpus showing 



pproach towards it ; but from the former of these groups the subfamily 



guished 



the 



of the male having three joints clothed beneath with 



ragged squamse, and from the second by the presence of two (instead of one) superorbital 





setee. 













DIPLOHAKPUS 















t 



Biploharpus, Chaudoir, Bull. Mosc. ii. p. 394 (1850). 



A genus exclusively tropical American. The majority of the species are distinguished 

 from Perigona by the elongated straight and porrected mandibles, maxillae, and palpi ; 













. 













but these are connected with normal forms of Perigonw by species showing nearly all 

 gradations of structure in this respect. Seven species have been described. 



1. Diploharpus exstriatus. 



Biploharpus exstriatus, Bates, Proc. Zool. Soc. 1878, p. 601 



subiridescens ; partibus oris, antennis pedibusq 









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