IIARPALID.12. AGONU]\r. 85 



Sp. 2. Terricola. Apterux, nigro-piceus suhdepressus, elytrii obscure cyaneis 

 subtiliter punctato-striatis. (Long corp. 6 — 8ilin.) 



Ca. Terricola. Paykul. — Sp. Terricola. Sieph. Catal. No. 121. 



Head pitchy-black, smooth, glossy : thorax depressed above, shining, smooth, 

 pitchy, or blue-black, slightly channelled in the middle, and a deep, oblong, 

 bent fovea on each side at the base : the elytra broad, oblong-ovate, rather 

 depressed, blue-black, or bluish, rather shining, regularly though obsoletely 

 striated, the strife very slightly punctate ; interstices rather convex, subco- 

 riaceous ; a marginal series of subocellated fovese : body beneath and legs 

 pitchy-black : tarsi reddish : antennie rusty-brown : palpi, mouth, and labrum 

 pitchy-red. 



Like the last insect, Sp. Terricola frequents cellars, outhouses, 

 and confined places among the " busy haunts of men," throughout 

 the metropolitan district. It is also very common near Bottisham. 



Genus XXXV. — Agonum, Bonelli. 



Palpi with the terminal joint fusiform, truncate, of the r^ame length with the 

 third : labrum quadrate, transverse, obsoletely emarginate : mandibles acute, 

 denticulated at the base : mentum with an acute triangular tooth in the 

 centre of its notch. Antenna; Imesx ; the third joint about twice as long as 

 the second, which is shortest, the terminal one longest : head elongate : thorax 

 depressed, smooth, the posterior angles rounded : body depressed : elytr.t 

 slightly emarginate at the tip : wings two : claws simple : anterior tarsi of 

 males with three dilated joints. 



The genus Agonum may be known from the preceding by the 

 form of its thorax, which is either suborbicular or subovate, with 

 the hinder angles rounded, and by the mentum, which is furnished 

 with a simple acute tooth : from Odontonyx and Synuchus it is 

 discriminated by the want of denticulations to the claws. The 

 species resemble each other so closely, that it is extremely difficult 

 to unite some of the varieties with their legitimate partners; and 

 were it not for their diiferent localities and habit, I should be in- 

 duced to expunge three or four of them from the list. However, 

 most of them are acknowledged by the continental writers : they 

 usually frequent damp and marshy places. 



A. With the thorax nearly orbicular. 



Sp. 1. marginatum. Viride aid cupreum, antennarum hasi tlhiisqite testtceis; 

 elyiris tenus striatis, disco tripunctatis, margine Jlavo. (Long. corp. 4 — 5 hn.) 

 Ca. marginatus. JAnn. F. — Mart. C. pi. 35./. Id.—Steph. Catal. A^o. 122. 



Head green, shining : mouth and palpi pitchy : antennae black, the first joint 

 dusky testaceous : thorax acutely margined, the margin itself obscure testa- 

 Mandibulata, Vol. I. 1st February, 1828. m 



