224 [September, 



I have in my hands at the present time a large number of S. granularis, and 

 have given them a careful examination. I have also seen Mr. Chitty's series of H. 

 bilineatus, from Deal. The conclusion I have come to is that while we have two 

 distinct species or forms in Britain, they cannot be separated by the colour, shape, 

 or position of the first line, since even in insects from the same pond these are all 

 very variable ; the first line is even wanting altogether sometimes, and in no British 

 specimen that I have seen does it reach the base of the elytra. The form of the 

 body in the genus Hydroporus is not a character of great value in separating species, 

 many of them are very variable in this respect. In both the insects in question the 

 male is rather more elongate than the female. JT. hilineatus has, however, a 

 more marked disparity in the sexes than H. (jrantdarif!. The average size of the 

 latter is also rather less. 



There remains the character derived from the claws of the anterior tarsi of the 

 male. It is difficult to see, and still more difficult to describe. Dr. Sharp has 

 appreciated it, so also has Bedel, since his description of the male of granularin, 

 " i angles des tames ant. inegaux, Vexterne trh-lonq," applies very well to the S 

 of b/Uneatux. Beyond the larger average size, usually more defined fii'st line, and 

 slightly more elongate form of IT. hiVmeatu", I have not discovered a good character 

 to separate the females of the two species ; these may be known from the other 

 sex by the less dilated anterior and intermediate tarsi, the second joint of the latter 

 being not, or hardly, broader than long, and by the simple anterior claws. 



The males may be separated by the following characters, whicli I have some- 

 what modified from Dr. Sharp's " Di/tiscida :" — 



Anterior tarsal claws very long, compressed laterally, and thickened underneath 

 from base to very near apex, then suddenly narrowed into a hair-like point ; hind 

 tibiae scarcely dilated on inner side, which is finely setose ; average size larger. 

 L., 2\ — 2 J mm H. hilineatus, Sturm. 



Anterior tarsal claws as above, but shorter and much less conspicuously dilated ; 

 hind tibisB roundly dilated on inner side, which is strongly setose ; average size 

 smaller. L., 2 — 2imm R. granularis, Ij. 



The principal minor character to which Dr. Sharp refers is the punctuation of 

 the posterior coxse and middle of the metasternum, which is rather strong in granu- 

 laris, and obsolete in hilineatus. I have not been able to verify this character. 



12, Churchill Eoad, N.W. : 

 July \Gth, 1903. 



AN ANNOTATED LIST OF NEUROPTERA PLANIPENNIA 



COLLECTED IN WEST CENTRAL SPAIN BY DR. T. A. CHAPMAN 



AND MR. G. C. CHAMPION IN JUNE AND JULY, 1902. 



BY ROBERT McLACHLAN, F.R.S., &c. 



At pp. 7 — 9 ante,l gave an enumeration of the Odonata collected 

 by Messrs. Chapman and Champion, in what may be termed the dis- 

 trict of Bejar, in the summer of last year, with notes on the localities 

 visited. I now treat the few Planipennia in the same" manner ; with 



