276 Rev. A. Matthews ok the genus Anililyopiuus. 



character in Avliicli Amhli/opiniis agrees exclusively witli the 

 Tachyjwridcv consists iu the laminate extension of tlie frontal 

 covering of the head, or what might have lieen tei-meil the 

 clypeus, if that part had been defined. I do not think that tliis 

 one ]ioint of resemblance is sufficient to counterbalance the dis- 

 crepancies which exist in manv chnractei's of much greater 

 differential imi^ortance. In the Taclii/porida; the intermediate 

 coxa? are comparatively small and rather dee])ly and abruptly 

 imbedded in the meso-sternum, which is i;ot in anv wav depressed 

 for their accommodation. In Aiahli/opinys the nieso- and meta- 

 sterna are of a totally different type, and the former of these 

 parts is deeply depressed for nearly the ^vhole of its length and 

 breadth to receive tlie very large intermediate coxaj, which are 

 entirely free ; a form ])reciselv similar to that exhibited In* 

 Philonthtis and Quedius. The mandibles, though of a very 

 peculiar shape, are long, much curved, and armed with long and 

 A-ery strong teeth, as in manv .Phdontfii ; Avhile on the other 

 hand the mandibles of the Tachypa) idcv are foi- the most part 

 short, robust and simple. From Quedius^ to Avhich in many 

 respects it bears a strong resemblance, Amhlijopim(S differs 

 materially iu the Episterna of the ])rothorax ; in the former 

 these parts are excessively enlarged and produced triangularly 

 until they almost meet behind the anterior coxa?, covering, as 

 pointed out by Dr. Erichson, the prothoracic stigmata ; in the 

 latter the Episterna are small and linear, indeed, scarcely ob- 

 servable, and the ])rothoracic stigmata are open and uncovered, 

 and large as in Pltllontlms ; tliis important character, together 

 Avith the general diversity of form, Avill be sufficient to separate 

 A)/Myo])inns from Qjiedius, althougli in many anatomical details 

 these genera are almost identical. 



It Avill be observed that in the preceding paragraph I have 

 called the triangular plates, Avhich in (^uedivs and some other 

 genei'a extend over the ])rotlioracie stigmata, tlie Episterna, and 

 I think that I am justified in using that term, by dissections 

 Avhich I have made of the jn-othorax ; these immersed in Canada 

 Balsam exhibit, as in diagram <S, a suture jiroceeding from tlie 

 anterior extremity of the jmisternuni, in a line somewhat snh- 

 parallel Avith the mai-gin of (he pronotuin to Avithiii a shorl 

 distance from its base. A faint suture is also \ isiblc at the Imse 



