142 Mr. G. J. Arrow on 
misled by an incorrect observation of the form of its 
maxille, and has removed it from the first series. He has 
not, however, transferred it to the second series, but 
has made for it a special group, of which the distinguishing 
features have little value. The projecting shoulders, which 
are chiefly relied upon, disappear in the species now called 
Micrencaustes. 
The second series (Erotylini genuini) of Lacordaire (the 
Jrotylites of Chapuis) consists entirely of Neotropical 
genera, with the addition of the single Old World genus 
Aulacochilus. 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 
and more ovate form, shorter antennz, and less dilated 
tarsi of Aulacochilus. The peculiar form of the antennal 
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 gene, which distinguishes this group of 
genera from all others. These are sharply elevated at the 
sides of the mouth, walling-in the latter im 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. ‘his 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 Jficren- 
caustes. It is nearly related to M. 6-gutiata, 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 Erotylide which can, in 
my opinion, be admitted as African :— 
Club of the antenna articulated. 
Ath joint of the tarsus reduced. 
Last joint of the maxillary palpus longitudinal. 
Antenne very slender, with the club very 
NOLTOWS Toot eee Oe eee Oe, Le Linodesmus. 
