ATHYREUS. 109 



considerably larger. The three species A. Ufurcatus, Macleay, A. tridens, King, and 

 A. championi are, however, very closely allied. 



2. Athyreus fissicornis. (Tab. VII. figg. 1,6 ; la, side view of head and 

 thorax.) 



Athyreus fissicornis (Klug, MS.), Harold, Stett. ent. Zeit. 1880, p. 45 \ 



Castaneo-fulvus dorso castaneo-fuscus, vel toto Mvo-testaceus, capite thoraeeque crebre (in locis concavis 

 sparsius) granulatis ; elytris dense granulato-punctatis, sed sat nitidis, striis paueis versus basin obsoletis : 

 epistomate prope margin em anticum transverse carinato ; clypeo breviter tridentato, fronte profunde con- 

 cava ; thorace fere sicut in A. pholas, "Westw. (Trans. Linn. Soc. xx. t. 22. f. 8), dorso profunde concavo 

 carinaque utrinque flexnosa medio late dentata et postice intus inflecta, margine antice medio valide 

 dentato. 



cJ major. Thoracis dente anteriore alto valido, apice bicuspidato ; carinis postice intus curvatis nee versus 

 marginem posticum parallelis. 



J minor et $ . Thoracis dente anteriore minore, apice acuminato ; carinis postice intus ramulum brevem emit- 



tente deinde versus marginem posticum continuatis parallelis. 

 Long. 10-11 millim. 



Hab. Mexico \ Cordova (Salle), Jalapa (Edge) ; Guatemala (Salle). 



The armature of the thorax can be best understood on referring to Westwood's 

 figure of A. pholas, an allied Colombian species. The carinae which limit the deep 

 dorsal concavity are nexuous both vertically and laterally ; about the middle they 

 rise highest and there form a large triangular tooth, each slightly curving towards its 

 vis-a-vis, and behind they curve sharply inwards. In A. pholas the opposite carinae 

 behind meet at the dorsal line, but in A. fissicornis they stop far short of it. The 

 strong tooth or spine rises vertically from the middle of the anterior margin as repre- 

 sented in Westwood's figure, but in well-developed males it is higher, reaching nearly to 

 the level of the thorax, and broad and cleft at the apex ; in males of lesser development 

 (or females X) the spine is shorter and pointed as in A. pholas and A. trituberculatus 

 (Klug), and a little removed from the margin. The carinae in the same individuals 

 differ in continuing, behind, parallel to each other, and emit a small branch inwardly 

 towards the dorsal line, exactly as represented in Westwood's figure of A. reiehei ; this 

 latter is doubtless the female of a species allied to A. fissicornis, in which the sides 

 of the clypeus are obtuse. The anterior tibiae have six teeth. 



A male specimen from Mexico is figured. 



3. Athyreus tridenticeps. (Tab. VII. figg. S, c? ; 8 a, side view of head and 

 thorax ) 



A. tridentato (Klug) similis et affinis, quoad colores haud differt, rufescenti-fulvus, supra (thoracis lateribus 

 fulvis exceptis) saturate castaneo-fuscus, dense pubescens pilis rarioribus elongatis intermixtis; capite 

 acute granulato, fronte plana declivi, clypeo reflexo, valide tridentato fere spinoso, dente mediano majore 

 robusto antice ab epistomatis basi surgente ; thorace dense granulato, margine juxta foveolam indentato 

 et antice medio tuberculo parvo, dorso excavato, fundo irregulari, longitudinaliter sulcato et juxta mar- 

 ginem anticum profunde foveato, ibique et postice sublaevi, carinis duabus verticaliter valde fl.exu.osis,. 



