526 Transactions of the Society. 



added the descriptions of one or two novelties, together with 

 drawings of details of several species which have not hitherto 

 been figured. 



The slender build of the Hawaiian A. perkinsi Burr is easily 

 recognized. 



A certain number of Old World forms have the abdomen dilated 

 towards the apex, so that the broadest part is the posterior margin 

 of the tenth tergite ; all these were previously ranged in the genus 

 Gonolabis ; to-day this genus is much restricted. Two species have 

 been removed to Eulabis Zacher ; these are the rare Javanese, 

 E. kirbyi Burr, of which only two specimens are known, and the 

 other the large and powerful E. michaelseni Burr from Western 

 Australia ; in both these the dilation is effected abruptly, so that 

 the sides of the abdomen appear to be concave when viewed from 

 above. 



The single African species, G. picca, is removed to Apolabis on 

 account of the form of the genitalia; the remainder are divided, 

 according to the shape of the metaparameres, into Mongolabis, 

 containing the three Australian species, and Gonolabis proper, with 

 only Oriental species. 



In Gonolabis proper the synonymy is rather confused ; it is 

 worth while, perhaps, repeating that G. hilkenthali Zacher is the 

 second known specimen of G. javana Borm., well characterized by 

 the keel on the under surface of the ninth sternite of the male. 

 G. electa Burr, from the Malay Archipelago and Ceylon, may be 

 known by its small size and the proportionately very great dila- 

 tion of the abdomen ; Mongolabis pacifica Erichs., from Australia, 

 by the dull, deep, pitch-black colour ; M. brunneri Dohrn, of 

 which Gonolabis verhoejfi Burr is a synonym, by the tooth on the 

 top of the forceps. 



The common Malayan, G. oblita, with a gradually dilated 

 abdomen, is often mistaken for G. javana in collections, and was 

 probably confused by Zacher, unless his G. sumatrana is really 

 G. oblita ; the true G. sumatrana is a relatively much larger 

 insect, and of a deep chestnut-brown colour rather than black. 



Certain species can be eliminated without difficulty, thanks to 

 some well-marked character ; such are Anisolabella braueri Zacher, 

 from North-East Africa, in which the segments of the antenna? are 

 extremely short and knotted ; also Anisolabis maxima Brulle, 

 which only occurs in the Canary Islands, and can be recognized by 

 its length, the long forceps, and the tubercles on the tenth tergite 

 of the male ; also A. owenii Burr, from Liberia, in which the 

 ninth sternite of the male is produced to a point in the middle ; 

 A. incisa Borelli, from West Africa, where the ninth sternite has 

 a prominent triangular incision at the apex. 



Some species have a fairly well-marked personal appearance, 

 the expression, so to speak, which once seen, can always be recog- 



