128 LAMELLICOENIA. 



Hob. Mexico, Cordova (Salle), Jalapa (Edge); British Honduras, Belize (Blan- 

 caneaux); Guatemala, Cubilguitz, Senahu, Cerro Zunil, Las Mercedes (Champion). 



A large number of examples. Belongs to a group of smaller species, widely distri- 

 buted in Tropical America, in which the stria accompanying the fore margin of the 

 thorax is deep and continuous, and the upper surface more or less thickly punctured. 

 The present species agrees with the South-Brazilian A. semipunctatus in the puncture- 

 rows of the elytra scarcely reaching the base, and not being impressed at the apex or 

 forming there two or more sharp striae ; but it seems to differ in the greater regularity 

 of the rows, the punctures of which in A. semipunctatus are in many places out of line, 

 and the rows consequently confused ; in A. vicarius the rows are nearly straight, except 

 the second, third, fifth, and sixth towards the apex. The head (except the vertex) is 

 thickly covered with large, separated punctures, which are sometimes equally strong 

 throughout, and sometimes finer on the forehead than on the clypeus. The thorax differs 

 in form from that of the more typical Acanthoceri in having distinct, though rounded, 

 hind angles ; it is punctured almost as strongly on the disc as on the sides, but there 

 is a space in the middle of the lateral margins, a vague dorsal line, and a round spot 

 on each side of the disc smooth and polished ; the punctuation, however, varies in 

 strength in different individuals, the same as it does on the scutellum. 



5. Acanthocerus micros. 



A. semipunctato affinis ; multo minor et differt fronte lsevi tibiisque posticis extus striis subtilibus longitudinalibus 

 bic illic confluentibus inseulptis. E ininoribus ; clypeo (prsecipue basi) punctata, fronte verticeque lsevibus ; 

 tborace scutelloque punctulatis, spatiis lsevibus ; elytris striato-punctatis, stria 2 a et 3 a mox a basin fractis 

 et irregularibus, striis exterioribus versus apicem fere continuis. 



Long. 2^-3 millim. 



Hal. Mexico, Jalapa, Misantla (Edge). 



The chief distinction between this species and A. semipunctatus is furnished by the 

 widely different sculpture of the hindmost tibia?. Germar describes this sculpture (in 

 A. semipunctatus) as " Eunzeln welche durch zusammenfliesende punkte entstehen," 

 which Von Harold (Col. Hefte, xii. p. 35) further explains as " bilden die Eunzeln 



eine dichte aus kurze halbkreisen bestehende punktirung." This perfectly 



well suits our A. vicarius as well as A. semipunctatus; but A. micros shows in the tibial 

 sculpture no trace of small semicircles, the sculpture consisting of fine longitudinal partly 

 dichotomous and partly confluent lines. The approximation of the punctures almost 

 (but not quite) to the formation of linear stria?, in many of the rows at the apex of 

 the elytra, also distinguishes the present species. 



6. Acanthocerus rotundicollis. (Tab. VII. fig. 25.) 



Minutus, ameo-rufus, politissimus ; capite omnino convexo nee margine explanato, antice subtiliter discrete 

 punctulato, clypeo apice strigato ; tborace a basi oblique usque ultra medium ampliato deinde ad apicem 

 cuius angustato, toto sparsim punctulato, stria marginali anteriore integra ; scutello medio punctulato ; 



