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80 



ADEPHAGA. 



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Subfam. PTEB08TICHINM 



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EVARTHRUS. 



Evarthrus, Leconte, Journ. Acad. Nat 



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All the species hitherto described, twenty-five in number, belong to temperate North 



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The following belong 



America. 



labial palpi has two seta? only. According to Dr. Horn, thi 



ch the penultimate joint of the 



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in Pterostichus ; 



for its reception. 



it 



probable, h 



that a new 



ection should be merged 



ill eventually be formed 



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l. Evarthrus constrictus. (Tab. IV. fig. 4.) 



Subgracilis, convexus, niger nitidus, antennis, palpis et pedibus piceo-rufis ; capite mox pone oculos angustato, 

 foveis frontalibus linearibus fortiter impressis ; thorace sub orbicular i, ante angulos posticos subito sed 

 oblique angustato, angulis anticis distinctis, posticis obtusis, fovea basali utrinque profunda, linea dorsali 

 ante basin dilatata profundiusque exarata ; elytris ovatis, humeris nullis, striis fortiter (ante apicem et stria 

 7 a subtilius) punctatis, interstitiis vix convexis, 3° post medium unipunetato. 



Long. 5| lin. § . 







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Hab. Mexico (Salle). 



single example 1 



The 



the MS. name of Steropus 



Che? 



the Salle 



collection ; but it is closely allied to a North- American species of Evarthrus 



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PERCOLAUS. 



Gen. Perco affinis. Elongatus, convexus. Caput exsertum, elongatum, post oculos tumidum; collum crassum; 

 foveae frontales modice elongatse, profundse ; sulculus intraocularis modiee impressus ; oculi parvi, vix pro- 

 minentes. Antennae filiformes, normales. Mandibulse quam in Perco longiores et graciliores, hand striatse. 

 Mentum medio eonvexum, utrinque profunde eoncavum ; epilobia acuta, dente lato valde emarginato. 

 Palpi elongati, articulis ultimis linearibus maxillarium apice truncatis, labialium articulo penulfcimo 



bisetoso. Thorax elongatus, quadratus, postice angustatus. Elytra basi, juxta humeros excepta, immar- 

 ginata ; interstitia absque punctis. Prosternum apice obtusum. Metasterni episterna brevia. Ventris 

 segmenta simplicia. Tarsi <S nee dilatati nee subtus squamulati. 



Resembles the European genus Per cus in the obliteration of the basal fold of the 

 elytra, a small portion only remaining near the shoulders. It differs, however, in many 



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points, the chief of which is the simple anterior tarsi of the male. The tumid posterior 



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orbit of the eyes is much more elongated than in any species of Percus known to me ; 

 and the mandibles are longer and more slender. The anterior tibiae are not produced 

 externally at the apex. 



The genus is exceedingly interesting, as partly bridging over the difference between 



the Pterostichinse and the Morioninee. 



1. Percolaus champion! (Tab. IV. fig. 5.) 



Niger, nitidus, thorace elytris multo angustiore, elongato quadrate-, postice angustato, angulis posticis rectis 





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