Brachytron. 171 



Odon. 91 (1890). Lihclliila aspis, Harr. Expos. Eng. 

 Ins. 92, t. 27, f. 3, ? \\'j>>i;. .-Es/ina vcrnalis, Lind. 

 Opusc. Scient. iv. 159, t. 4, f. 1 (1823); Lind. Mon. 

 Lib. Eur. 21 (1825); Steph. Illustr. Brit. Ent. Mand. vi. 

 85 (1836). ALschna vcrnalis, Sel\-s Alon. Lib. Eur. lOO 

 '1840). BrncJiytron vcrnalis, E\-ans Brit. Lib. 22, pi. 13, 

 r. I, $ (1845). ^-Eschna pilosa, Charp. Hor. Ent. 37 

 (1825); Charp. Lib. Eur. 106, t. 21 ( 1840J. 



Miiller's description. 



Libellula pratensis alis liyalinis ; thoracis lateribus 

 fasciis virentibus octo, anticc tribus fuscis. (O. E. 

 AUiller, " Eauna Lisectorum T^-idrichsdaHna," p. 62, No. 

 543* 1764.) . . . LibeUula Hafniensis ahs basi mar- 

 gincque superiori aureis : thoracis lateribus sex-fasciatis : 

 abdomine i/i^i^ro liucis pitnctisqiic snlplnircis. \0. E. Miiller, 

 ' Eauna Lisectorum Eridrichsdalina," p. 61, No. 542. J 



[^^liiller here make> iwo species of the different sexes. It 

 seems better to retain pratensis, tlie name lie bestowed on the 

 male, not only because the name of the male would i)e more naturally 

 chosen, but chiefly because it ha> jiassed into common use. All 

 that can be said in favour of the female name, Jiafniensis, is that 

 it stands before the other in Midler's list.] 



Size. 



Length of Male, 57'5mm. ; expanse of wings, 7r5 to 

 74inrn. Length of Eemale, 54"5mm. ; expanse of wings, 

 74m m. 



Male Imago. 



Face yellow, with black hairs ; labium orange, with 

 black border ; border of labrum black ; rhinarium black ; 

 black line between frons and nasus ; black transverse 

 line along the carina of nasus, joined b>- black stem to 



* Xo. 543 is the male, and No. 542 is the female. 



