278 I\Ir. C. J. Galian c/ii larvic of Tridenotoma childreni, 



characters in common with the larvas of ri/thid/v, Fj/ro- 

 chroidx and (Edcmcridm, and the chief differences, which 

 are to be found in the form of the 8th and 9th segments of 

 the abdomen, are of only secondary importance and such 

 as might be found to occur between different genera of the 

 same famil}'. The presence of scabrous areas on tlie ter- 

 gites and sternites of several segments in Tridenotoma is 

 a character wanting in the larva? of Pytliidtv and Pyro- 

 chroidR', but seems to have a correspondence with the 

 scabrous elevations or tubercles occurring on certain of the 

 segments in the larvae of (Ed emerid ti\ 



On the whole, then, it seems to me that the T'ridcnoto- 

 viid/i\ in a phylogenetic system such as Ganglbauer's, 

 shovdd be placed not at the end, but at, or very near, the 

 beginning of the Heteromerous series. Although the 

 general appearance of the imago seems very unlike that 

 of the F//rochroid/v or (Edemeridx or the other families 

 allied to these, yet it must be remembered that in one 

 very important structural character, namely the open 

 anterior coxal cavities, the TridaiotomidcV agree with these 

 families and differ from the Tcnchrionidx. 



2. The larva oi Mdittomina insvlarc, Fairm. 



Mditlomma insuhnr, Fairm., is a species of Ly/uer//Iidx 

 that was first described in 1893 (" Bull. Soc. Ent. Fr."i893, 

 p. cccxxiii). It occurs in the Seychelles Islands, and 

 differs considerably from other species of the genus Mditt- 

 omma in one character which appears to have been over- 

 looked by the original describer; the eyes, instead of 

 being widely separated from one another on tlie ventral 

 side of the head, are very closely api^roximated and almost 

 contiguous. Some larva' of this species that were found 

 living in the stem of the coco-nut palm in the Seychelles, 

 were sent a few years ago to the Director of the Imperial 

 Institute, and by him were presented to the British 

 Museum, with a re(|uest for their identification. They 

 were accompanied by examples of the perfect insect. 

 Although no pupae have been received, there can be no 

 doubt Avhatever that the larvas belong to the species indi- 

 cated. These larva3 are of different sizes, varying in length 

 from about 10 to 30 miilim. ; nnd present a very strong 

 famil}^ resemblance to the other known larviu of Lymtry- 

 lidm, the only noteworthy difference consisting in the 



