276 Mr. Kenneth J. Morton on 



labrum margined with black posteriorly and at the sides; median 

 virgule of labrum black and well marked. Occiput yellow, swollen 

 above and behind, hairs yellowish. Behind the eyes black with a 

 narrow white line running along the lower part of each eye. 



Prothorax black; fore and hind margin yellow, the latter inter- 

 rupted in the middle. 



Thorax with two large cuneiform yellow bands in front, a minute 

 humeral yellow dot; two large lateral bands and between them a 

 narrow irregular band sometimes interrupted. 



Abdomen black with yellow markings as follows : on 1st segment 

 a narrow band on the lower posterior part of the segment ; 2nd 

 segment with a median dorsal band and a large anterior lower space 

 including the oreillettes, also a narrow posterior band sometimes 

 interrupted on the dorsal arete and on the sides ; segments 3 to 8 

 with median or sub-median bands more or less interrupted by the 

 dorsal arete, 7 and 8 distinctly so ; these bands except in 3 not 

 actually touching the ventral suture but carried well over the sides 

 of the segments ; each of these segments with terminal lunules {i. e. 

 representing the posterior bands) those of the last two being of a 

 small size ; 9 with a small lateral spot ; 10 entirely black. 



$. Very similarly marked ; segment 10 with a small lateral spot. 



This typical form is widely distributed in northern and 

 central Europe, including Scotland, Sweden and Denmark, 

 and it goes as far eastward at least as Silesia. In southern 

 France it seems to exist in the Pyrenees, and Navas records 

 it from Portugal and many parts of Spain, including the 

 Sierra Nevada. In other parts of southern France and of 

 Spain it seems to be replaced by immaculifrons. De Selys 

 says the latter is found in Italy and Austria, but the 

 distribution of the two still remains to be satisfactorily 

 worked out. 



Eace immaculifrons, Selys. 



De Selys (Monographie des Gomphines, p. 595) says that 

 the examples from the south of Europe differ more or less 

 from those of the centre and north in this that the yellow 

 occupies more space on the abdominal segments, while 

 the frons is ordinarily all yellow without transverse an- 

 terior line. He gives the following as the principal points 

 which serve to distinguish the best characterised southern 

 examples — 



The front is entirely yellow without transverse Hue ; the 



