1921.J F. F. I^AiDLAW : India II Dras,t)nflies. 77 



The dentigerous plate of the tenth segment is almost squarely 

 truncate posteriorly, and carries apically a number of small irregu- 

 larly placed teeth, about fifteen, on its ventral side. 



The anal appendages are small, about 2 mm. long, and are 

 carried in the specimen before me directed vertically upwards. 

 The discovery of a species of this genus in the Himalaya extends 

 its range greatly. Hitherto I can find records for Malaya and 

 Japan onlj^ nowhere within 1,500 miles of Darjiling. 



Jas,oria martini seems to come nearest to /. venatrix, Fors- 

 ter, from Buton in the Celebes group. The female of the latter 

 species is unknown. 



Series Brachytron. 



This series is characterized by the synmietrical forking of 

 Rs and by the presence of but a single row of cells between that 

 sector and Rspl , as well as between M^ and Mxpl. The series 

 contains genera which are probably rather primitive survivals of 

 the main trunk of the subfamily, representing to some extent the 

 ancestral line from which the dominant AcscJina group has been 

 evolved. 



India has at least three genera of the series, probably more. 

 Ausiyoacschna represented here by a single species is noteworthy 

 on account of its distribution ; all the other species (if we exclude 

 Planaesclnia mil nci , Maclach. treated by Martin as an Aitslroaes- 

 c/iiia) are Australian 



Periaeschna is also represented by a single species originally 

 described from Tonkin. 



Martin puts all the other Indian species in the Selysiau genus 

 Caliaeschna. He includes in it also an Australian species C. 

 conspersa, Tilly ard, since removed b\' Tillyard to a distinct genus 

 Dendroaeschna. 



Forster had already described a species, Caliaeschna laidlawi^ 

 from the Malay Peninsula. This species is evidently not a 

 Caliaeschna at all but seems to find its proper place rather in 

 Periaeschna. 1 have only two males and a female of Caliaeschna 

 microstigma from Persia, and a single female of the Caliaeschna 

 section of the series on which to base my observations, but as 

 these insects are of exceptional interest and are all rare I take the 

 opportunitj' of making a few comments on them. The single female 

 above noted I refer to as Cephalaeschna ? sp. 



In his monograph Martin omits mention of the Selj-sian genus 

 Cephalaeschna of which Cephalaeschna orbifrons, Selys, was the type. 

 He also omits mention of Karsch's species Cephalaeschna sikkima. 



De vSelys in defining Cephalaeschna states that the apical 

 margin of the dentigerous plate of the female is rounded and 

 subdenticulate. He was not acquainted with the female of 

 Caliaeschna at the time at which he wrote his "Synopsis des 

 Aeschnines." 



Karsch in his kritik accepts Cephalaeschna, but lays no stress 

 on this particular character, depending on the large development 



