ACANTHOCERUS.— APOKOLAUS. 129 



elytris utrinque striis undecim acute incisis, subtilissime punctulatis, aequaliter a basi usque ad apicem 

 impressis et inter se distantibus, interstitiis planissimis et minutissime punctulatis. 

 Long. 2 millim. 



Hab. Panama, Volcan de Chiriqui (Champio7i). One example only. 



Differs from all other Acanthoceri known to me by the convexity of the head being 

 continued to its edges ; and also by the form of the thorax, the sides of which are cut in 

 nearly a straight line, and obliquely from opposite the outer angle of the scutellum to 

 near the anterior angles, at which point the thorax is at its greatest width. On each 

 side of the basal margin of the thorax, near the angle of the scutellum, is a small 

 but conspicuous concavity. In the way the single example is mounted I cannot examine 

 the sculpture of the exterior face of the hind tibiae. 



Fam. ACLOPIME. 



APOROLAUS. 



Corpus elongato-ovatum, glabrum, lateribus et subtus cum pedibus longe pilosis. Clypeus brevissimus, antice 

 arcuatus ; labrum planum, clypeo fere sequale apice medio acuminatum. Mandibulae labrum amplecteutes, 

 intus ciliatae ; apice anguste prolongate, liberae, acute bidentatae. Maxillae inermes, lobo dense penicillato. 

 Mentum transverse quadratum planum, apice medio incisum. Ligula lobis angustis elongatis, diver- 

 gentibus. Canthus oculorum brevissimus. Antennae 9-articulatae ; clava compacta, art. 7° cupuliformi 

 caeteris includentibus. Elytra postice conjunctim rotundata, pygidium tegentia, margine apicali incrassato. 

 Pedes sat graciles ; coxae anticae conicae, exsertae ; tibiis anticis extus dentibus recte exstantibus tribus ; coxae 

 intermediae obliquae, contiguae; tibiae posticae, <5 , graciles, rectae, $ extus ante apicem sinuatae, apice 

 bicalcaratae. Tarsi mediocriter elongati ; ungues elongati, graciles, simplices, paronycbio bisetoso minuto. 

 Metasterni episterna elongata triangularia ; epimeris apicalibus parvis transversalibus. Segmenta ventralia 

 sex libera. 



An interesting generic form, connecting three families placed wide apart in Lacor- 

 daire's system, viz. Hybosoridae, Aclopidae, and Glaphyridae; and demonstrating that 

 the mouth-structure (especially the free bilobed ligula) is more to be relied upon than 

 the position of the abdominal spiracles as indications of natural affinity in this portion 

 of the Lamellicorn series. The legs (with the exception of the male developments) are 

 those of the typical Glaphyridee, the absence of transverse tibial carinae distinguishing 

 this genus from Aclopus, and approximating it to Glaphyrus, as also does the cupuliform 

 club of the antennae. The form of the metathoracic episterna and epimera is that 

 of Ccelodes in the Hybosoridae; and the shape and relative position of the clypeus, 

 labrum, and mandibles are the same as in Aclojpus, Hybosorus, and not essentially 

 different from the Glaphyridae. 



The abdominal spiracles are microscopically small ; with a powerful lens three are 

 visible on the connecting membrane, and a posterior one is just perceptible on the edge 

 of a ventral segment. 



biol. cente.-amee., Coleopt., Vol. II. Pt. 2, November 1887. SS 



