266 [May, 



17. NuEus, Rond. 



hcemorrhoidalis, Scliin., Meig.?, Macq.?. 

 Grey, marked and tessellated as in tlie preceding species. Thorax 

 with only two dorsal bristles behind the suture. Second abdominal 

 segment without central spines. First anal segment of ^ grey, second 

 red. No costal spine to wings. Fifth longitudinal vein bent at an 

 acute angle. Posterior tibise of ^ with a thick beard. 



Length, 5 — 6 lines. 



Head : face pale golden -yellow or grey. Frontal space occupying one-fourth of the 

 width of the head. A distinct black or brown stripe runs down the middle of this space, 

 which stripe is wider than the interval that separates it on each side from the e^'e. 



Thorax with only two large bristles in 

 the dorsal row, both of which are at the pos- 

 terior part behind the suture, all the others, 

 both before and behind the transverse suture, 

 are very small or almost obsolete (see figure 3). 



Abdomen without spines in the centre of 

 second segment. First anal joint of <J extruded 

 and grey, second red. Wings without costal 

 spine. Fifth longitudinal vein bent at an acute or siib-acute angle. Legs with posterior 

 tibise of S thickly, but not longly, bearded. 



$ similar to S , except in the usual se.xual differences. 



Common. 



18. Cruentata, Meig., Rond. 



Whitish-grey, striped and tessellated in the ordinary way. Fron- 

 tal stripe equal in width to the space between it and the eye on each 

 side. Fifth longitudinal vein bent at an obtuse or right angle. First 

 anal segment of ^ retracted. Length, 3^ — 1| lines. 



Sead : face 8ilvery-white. Frontal space rather wider than in S. nurns, with a dark 

 red or black stripe running down the centre, which is equal in width to the internal on each 

 side between it and the eye, which is of a whitish colour. 



Thorax with dorsal line of thoracic bristles as in S. nnrns. 



Abdomen without central spines on second segment. Anal segments of <J smaller in 

 proportion than in S. nurus, the first retracted and grey, the second red. Wings with the 

 fifth longitudinal vein bent at a more obtuse angle than in S. nurus. Legs bearded as in 

 S. nurus. 



? similar to (J , onlj' frontal space wider. 



Rare. Mr. Verrall's collection contains two (^ and two ? , all of 

 which were bred from pupae found in pigeon's dung, at Croydon, 

 Surrey, in which were the remains of dead pigeons. 



19. HiEMATODES, Meig., Macq., Zett., Schin., Rond. 

 Yellowish-grey, striped and spotted %ith brownish-black. Frontal 



