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278 



SUPPLEMENT. 



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proftmdissime sinuate. Pedes elongati, tibiae anticse apice perparum dilatatae, tarsi sat robusti plantis 

 velutino-pilosis, articulo quarto caeteris latitudine aequali, emarginato, angulo exteriori paullo longion. 



Mesothoracis episterna brevia. 



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A remarkable genus, partaking of the characters of both the subfamilies Pterostichinse 



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and Anchomeninse. Judging from the form of the parts of the mouth, the pubescent 

 soles of the tarsi and the emargination of the broad penultimate joints, I had included 





one of the species (I. lobipennis) in the genus Cyrtolaus ; but the sharp ridge proceeding 

 (underneath) from the external margin of the elytra near the apex (causing an appa- 



rent break in the margin just below the end of the epipleura) is a feature characteristic 

 of the Pterostichinse, and the genus must therefore be referred to that subfamily, in 





1. Ithytolus lobipennis. 



Cyrtolaus lobipennis, ante, p. 99. 



2. Ithytolus anomalus. (Tab. XIII. fig. 15.) 



Elongato-subovatus, nigro-piceus ; palpis, labro et antennis fulvo-rufis, pedibus castaneis ; oculis minime pro- 

 minentibus ; thorace elongato, medio rotundato, antice recte postiee sinuatim angustato, angiitis postieis 

 acutis, margine lateral! late depresso postiee elevato, basi utrinque medio sulco elongato lineari ; elytris 

 convexis, basi quam thoracis basi multo latiori, humeris dentatis, apice profundissime sinuatis, angulo 

 suturali breviter dentato, dorso profunde striato, interstitiis modice convexis tertio unipunctato, stria 1 

 basi cum stria 2 a conjuneta, striola seutellari obsoleta. 



Long. 5| tin. 



Hah. Mexico (Salle), Orizaba (coll. Bates). 



The totally different form of the thorax at once distinguishes this species from 

 /. lobipennis. 



l (a). Poecilus ? 



PCECILUS (p. 84). 



Hah. Mexico, Ventanas (Forrer). 



thorax. 



LOXANDRUS (p. 86). 



4. Loxandrus sculptilis. (Tab. XIII. fig- 14.) 



L. infimo affinis. Oblongo-parallelogrammicus parum connexus, nigro-picens ; elytris plus minusve opacis; 

 palpis, antennis basi (cseteris fuscescenti-rafis) pedibusque fulvo-testaceis (individuis immaturis thorace 



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which it stands alone in the Colp odes-like form and clothing of the tarsi. The sharp 



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submarginal ridge underneath the elytra exists also in Colpodes and Onypterygia, but it 



becomes obsolete before reaching the apical margin, instead of rising higher there and 

 forming, with the margin itself, a narrow groove for the interlocking of the raised edge 

 of the abdomen, a structure which is universal in the Pterostichinse. 



The three examples of the genus I have examined appear to be females ; I do not, 

 therefore, know the form of the anterior tarsi of the male. 



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A single female, possibly a variety of P. mexicanus, but having a more rounded 



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