S4 



HARD IVICKE'S SCIENCE- G OSSIF. 



them ■certain layers of shale containing fossils such as 

 Aviatlo-pccteiis, Goniatites, and fish remains. At 

 the bottom of the series is a bed of coal of about 

 '6 inches in thickness, having under it the usual seat 

 'earth, these lie conformably upon the rough rock, 

 llaving now given a brief description of the geo- 

 logical surroundings of the hard bed coal, I will 

 describe in my next paper some of the ]:)lant remains 

 found in the coal balls. 



( To he coiitliuicd.) 



CHAPTERS ON BRITISH DRAGON-FLIES. 



No. II. 

 By E. B. IvEJir-WELCii. 



CORDULIID.'K 



Eyes slightly prolonged posteriorly. 

 Triangle of front wings inequilateral, 



enclosing a transverse nervure. 

 Abdomen club-shaped. 



Genus CorditUa (Leach). 



/^ ARCTICA (Zett). Wings clear ; pterostigma 

 ^-^ ' black ; colour bronze-green ; a yellow spot 

 before each eye ; face spotted with yellow ; anal 

 appendages of the 5 closely approximated, with 

 three teeth beneath, semicircular at the extremity. 

 Habitat Perthshire in July. Length 21 lin.; exp. 

 30 lin. 



C. ccnea (Linn.). Wings clear; accessory membrane 

 reddish ; pterostigma black ; colour bronze-green ; 

 face not spotted ; upper anal appendages of the 5 

 sub-cylindrical, the points turned outwards ; lower 

 anal appendages forked. According to Charpentier 

 (Lib. Eur. pi. 14) the wings of the 2 are" of a clear 

 brown colour. Habitat England ; local. Length 

 20 lin. ; exp. 30 lin. 



Triangle of front wings equilateral without included 

 nervure. 



C. Ctirtisii (Dale). Wings clear ; pterostigma 

 black ; colour bronze-green, face of same colour ; 

 abdomen cylindrical (5), compressed (2) with dorsal 

 yellow spots ; anal appendages of 5 subcylindrical 

 with a spine inside at base. Found in the New 

 Forest, and near Bournemouth. Length 20 lin. ; 

 exp. 30 lin. 



Labium, or lower lip, larger than the palpi. 

 Eyes remote, labium rounded at the tip. 



Genus Goiiiphus (Leach). 



G. viilgalissiinits (Linn.). Wings clear ; accessory 

 membrane yellow ; pterostigma black ; costal ner- 

 vure black outside ; legs black ; thorax yellow, 

 ^\■ith six broad straight black stripes arranged in a 

 pattern ; three green spots between the wings ; 



abdomen black with a suddenly-narrowing yellow 

 dorsal stripe, terminating at the seventh segment ; 

 eighth and ninth segments with yellow patches 

 laterally ; anal appendages of the 5 spear-shaped, 

 diverging widely. Local in England and Irelai.d. 

 Length 22 lin. ; exp. 28 lin. 



G.flavipes (Charp.). W'ings as above ; legs yellow, 

 streaked with black ; thorax yellow, with six curved 

 black stripes ; abdomen black, with a dorsal yellow 

 stripe continuous through all the segments ; anal 

 appendages of 5 cylindrical, pointed, widely diver- 

 gent. Has been taken at Hastings (in August). 

 Length 24 lin. j exp. 33 lin. 



G. forcipatiis (Selys). Wings clear ; accessory 

 membrane clear ; pterostigma black ; legs black, 

 posteriorly yellow on the femur ; thorax black, with 

 a yellow pattern ; abdomen black, with dorsal 

 lanceolate yellow spots ; (the ? has also yellow 

 lateral spots) ; upper anal appendages of the 5 

 curved round like forceps, the points bifid ; tlie 

 lower contiguous, straight and pointed. Has been 

 taken in England. Length 23 lin. ; exp. 28 lin. 



Eyes more nearly contiguous. 

 Labium cleft at the tip. 



Genus Cordulegastcr (Leach). 



C. aiiuulaliis (Latr.). Wrings clear ; pterostigma 

 (9) black, (5) lighter; costal nervure yellow exter- 

 nally ; back of the head yellow ; upper lip yellow ; 

 thorax black, with eight yellow stripes ; abdomen 

 (strongly clubbed in the 5 ) black, with a yellow 

 band at the middle of each segment. England, 

 Scotland, and Ireland generally. Length 32 lin. ; 

 exp. 42 lin. 



Eyes quite contiguous. 



./ESCHNID^. 



A. Anal angle of hind wings acute (5), and rounded (: ). 



Genus ^schna (Fabr.). 



yE. pratensis (Miill.) Wings clear, rather tinged 

 towards the base wit 1 yellow in the 9 ; nervures 

 reddish ; pterostigma long and narrow, reddish ; 

 accessory membrane small ; anal angle of hind wings 

 (5) not very acutely angular ; thorax brown, hair\-, 

 with two yellow bands on the shoulders ; abdomen 

 cylindrical, brownish-black, spotted with blue in the 

 5 , and yellow in the 9 ; anal appendages of 5 long, 

 triangular, hairy, and curved inwards. England, 

 Scotland, and Ireland, generally. Length 26 lin. ; 

 exp. 34 lin. 



^E. i/iijcla (Latr.). Wings clear (5), uniform liglit 

 brown (2 ) ; accessory membrane darkish ; pterostign;a 

 dark ; thorax brownish-black, with two spots on the 

 front, and two bands on the sides, yellow ; abdomen 

 slender, cylindrical ; in the 5 contracted near the 

 base ; brownish-black spotted with dark blue in tlie 

 5 , and with yellow in the 2 ; anal appendages of 5 

 long, scalpel-shaped ; the lower long and triangular 



