230 [August, 



segments are without setae on the disc. N. ruhrica has the thorax marked with 

 four longitudinal stripes of nearly equal width, and has four external dorso-central 

 bristles behind the transverse groove ; the scutellum is reddish-brown, the apex 

 usually only being rufous in the female ; the palpi and the two basal joints of the 

 antennse are red ; the abdomen is reddish-yellow with a black longitudinal stripe, 

 and shows white reflections; the wings are brown with yellow roots. Very rare. 



N. PUPABUM, P. 



This is distinguished from all the other recorded British species by having the 

 cheeks below the termination of the fronto-orbital bristles clothed with a few fine 

 scattered hairs.* The cheeks are white with black reflections, and the hairs upon 

 them are pale in colour and not very easy to see. The chin is thickly covered with 

 long hairs ; the eyes are subcontiguous in the male ; the palpi are yellow ; the an- 

 tennae have the basal joints grey or sometimes red, and the third joint black-brown 

 with the base often red ; the thorax has three stripes, the central one being very 

 wide, and four external dorso-central bristles behind the transverse groove ; the 

 scutellum is rufous ; the abdomen is blackish-brown, the sides of the second and 

 tliird segments being red in the male ; the fi-ont borders of the second, third and 

 fourth segments are also encircled with an even, wide, subinterrupted white band ; 

 the wings have the fourth longitudinal vein bent at an acute angle, the external cross 

 vein sinuous, and the little cross vein nebulous. Rare. 



N. STBENUA, Mgn. 



This has the cheeks quite bare ; the antennae are in great part yellow, and paler 

 in the female than in the male ; the eyes in the male are subcontiguous ; the peris- 

 tome is red ; the thorax is marked with four rather narrow stripes, and has four 

 external dorso-central bristles behind the transverse groove ; the scutellum is red, 

 with the base mostly black ; the abdomen is shiny black, having red sides in the 

 male and indistinct white transverse bands ; tlie wings are yellow at the base, with 

 the external cross vein oblique and sinuous, and the little cross vein nebulous. Not 

 common. I found both males and females in Oxfordshire in 1883, it is also in Miss 

 Decie's collection captured at Westward Ho ! and I received a specimen from Mr. 

 Harwood of Colchester. 



N. VAGANS, Mgn. 



This differs from the former by having the antennae more nigrescent, the apex 

 of the second joint and the base of the third only being rufous ; by the thorax being 

 marked with three instead of four stripes, and by the scutellum being red only at 

 the tip. Eare. Captured by Mr. C. W. Dale at Blair Athol in June, 1883 ; found 

 also by Mr. Harwood at Colchester. . 



N. APPEKDICULATA, Mcq.f 

 This has the eyes in the male rather widely separated, the frontal space occupy - 



* These characteristic hairs must not be confounded with others that are present on the sides 

 of the frontalia in this and other species between the fronto-orbital bristles and the eyes. 



t Ann. d. 1. Soc. Eut. de Fr., 11, 6, llL'. 



