198 LAMELLICOENIA. 



28. Lachnosterna gigantea. (Tab. XI. fig. 10, s , var.) 



L. lebasii (Blanch.) affinis ; maxima, oblonga, rufo-fusca vel nigra, capite, thorace, scutello, elytris et pygidio 

 subtilissime densissime punctulatis et breviter incumbente pubescentibns ; capite grossius subalveolato- 

 punctato, clypeo mediocri, obtuse rotundato, margine elevato medio breviter sinuato vel integro. 



$ . Pygidium convexum, margine apicali acute reflexo fimbriato. Venter subtilissime punctulatus et pubescens, 

 medio canaliculars, suturis medio angulatis ; segmento 5° medio contracto, margine apicali utrinque 

 sinuato, spatio triangulari mediano granulato-ruguloso, lateribus utrinque transversim uniplicatis ; seg- 

 mento 6° brevi, transversim anguste concavo (medio earinato), marginibus elevatis, incrassatis, posteriore 

 medio fisso. Calcaria postica elongata, libera. Ungues fere sicut in L. setifera, dente mediano elongato 

 (denti apicali aequali) ; basi mediocriter dentato-dilatati. Antennarum clava valde elongata cseteris 

 articulis multo longior, articulis 5°-7 m intus acute productis. 



? . Pygidium sicut in S , sed apice paullo prolongatum. Venter subtilissime punctulatus et pubescens, seg- 

 mento 5° caeteris longiore, postice transversim canaliculate subplicato, 6° piano crebre punctato. 



Long. 22-28 miUim. 



Hab. Nicaeagua, Chontales (Belt, Janson) ; Panama, Chiriqui (Trbtsch), Bugaba, 

 Volcan de Chiriqui 4000 to 6000 feet (Champion). 



Seven examples, of which three from Chiriqui are black or brownish-black, including 

 the legs and antennae ; the others are castaneous (including the antennae and legs) ; 

 one (from Chontales) differs from the rest in having but a slight trace of sinuation in the 

 anterior margin of the clypeus. In all other respects the specimens perfectly agree. 



A Chontales example is figured. 



29. Lachnosterna setifera. (Tab. XI. fig. 11, 6 .) 



Ancylonycha setifera, Burm. Handb. der Ent. iv. 2, p. 335 \ 



Hab. Mexico 1 , Presidio (Forrer), Orizaba, Juquila (Salle), Jalapa (Edge) ; British 

 Honduras, E. Sarstoon (Blancaneaux) ; Guatemala (Salle), Volcan de Atitlan, Pan- 

 taleon, Zapote, Dueiias (Champion); Panama, Chiriqui (Ribbe). 



Distinguished from L. crinalis by the sixth ventral segment in the male having its 

 anterior margin raised and dilated above, so as to impend slightly over the concave 

 centre of the segment, and cleft in the middle. This structure is no doubt that meant 

 by Burmeister by the phrase " die analgrube mit hoher, in der mitte gespaltener 

 Querfalte am Vorderrande." A similar " fold " is observed in L. longipilosa 6 , but 

 there is a difference between the two species, the fold being biarcuated in L. setifera, 

 and produced in the middle, the margin of the preceding (fifth) segment being corre- 

 spondingly produced ; in L. longipilosa the margins of both segments are straight. In 

 L. crinalis the fore margin of the sixth segment is somewhat thickened but riot raised. 



L. setifera is further distinguished by the opaque and very faintly punctured 

 pygidium, which is rather densely clothed with erect greyish hairs, the tip in some 

 examples being smooth and shining. The claws have their well-developed lower tooth 

 (a little longer and broader in the female than in the male) very nearly in the middle, 

 its lower edge being finely denticulated ; they have only a slight angular dilatation at 

 the base, and there is a considerable interval between the dilatation and the tooth. 



