142 Mr. G. J. Arrow on 



misled by an incorrect observation of the form of its 

 maxilljB, and has removed it from the first scries. He has 

 not, however, transferred it to the second series, but 

 lias made for it a special group, of which the distinguishing 

 features have little value. The projecting shoulders, which 

 arc chiefly relied upon, disappear in the species now called 

 Micrencaustes. 



The second series (Erotylini genuini) of Lacordaire (the 

 Erotylites of Chapuis) consists entirely of Neotropical 

 genera, with the aildition of the single Old World genus 

 Anlacochilus. A comparison between this genus and 

 Micrencaustes will reveal the interesting fact that they 

 are really very closely allied — and indeed identical — in all 

 essential points of structure, differing only in the shorter 

 arid more ovate form, shorter antennae, and less dilated 

 tarsi of Aulacochilus. The peculiar form of the antenna! 

 club, the coarsely facetted eyes, strongly transverse last joint 

 of the maxillary palpus, and the general conformation of the 

 mouth are the same. Most important of all is a peculiar 

 development oF the gente, which distinguishes this group of 

 genera from all others. These are sharply elevated at the 

 sides of the mouth, walling-in the latter in continuation of 

 the mandibles, and forming a rest against which the delicate 

 sensory surface of the last joint of the maxillary palpus 

 is applied when in repose. This conformation I consider 

 most essentially distinctive of the Encaustini, consisting of 

 the four genera Aulacochilus, Micrencaustes, Encaustes, and 

 Asmonax. As showing the closeness of the relationship 

 between the first two of these, I may mention that the 

 Philippine species described by M. Bedel as Aulacochilus 

 maximus would, in my opinion, be better placed in Micren- 

 caustes. It is nearly related to M. ^-guttata, Gorh. 



For the purpose of the present revision, I have examined 

 the African types of Crotch in the Cambridge Museum, but 

 these do not include the species described by him from 

 Andrew Murray's collection, the location of which is 

 unknown to me. 



The following Synopsis gives briefly the differential 

 characters of all the genera of Erotylidse which can, in 

 my opinion, be admitted as African : — 



Club of the antenna articulated, 

 4th joint of the tarsus reduced. 



Last joint of the maxillary palpus longitudinal. 

 Antennae very slender, witli the club very 



narro'>v Lmodesmus. 



