1918.] 75 



spiracles, but nearly on a line with these, or a little anteriorly, are two 

 small discal dark spots. In front of these is a conspicuous transverse 

 line of 6 or 8 whitish spots on the middle third of the width of tlie 

 thorax, these spots having an appearance of oil or fat drops. Whether 

 they would always be present I do not know. There is a fuscous stain 

 or vague band across the brood-chamber opening, from the ends of which 

 two fuscous subparallel bands extend forward on to the. head and back- 

 Avards to the spiracles or to the basal black band. The width of the 

 thorax across the spiracles is 7*5-8 times the distance between the inner 

 edges of the mandibles. 



2. — H. cyliiulrici sp. n. 



This might perhaps be only a large variety of the preceding. 

 Measured in the same manner, its "width is 1*2 mm., the length from 

 •9-1 mm., the width being 8 times the width between the mandibles. 

 The pattern of marking is nearly the same as in the preceding, a faint 

 smoky suffusion from the basal band to the small dark spots (which lie 

 on or near the line joining the spiraclesj is more distinct. The discal 

 band of pale spots is much less distinct, the spots being smaller and less 

 wdiite, and therefore less easih'^ distinguished from the ground-colour. 

 This Stylopid is not common, seeing how abundant is its host, but it is 

 widely distributed in the south of England. The stylopized $ of 

 Hallctus calceatus {cylindricus) lives through the Avinter, and the 

 Halictoxenus triungulins may be seen emerging from the parasite in 

 early spring. I have never myself taken a bee from which the 6 of 

 this parasite had emerged. Smith recorded the very closely allied 

 H. alhipes as being stylopized, but the specimens so named in his 

 collection are //. calceatus. 



8. — H. tmmdorum, sp. n. 



The w^idth across the spiracles is 1 mm., the length from the hind 

 margin of either of these to the middle of the front margin of the head 

 '9 mm., the width being about 7'o times the distance between the 

 mandibles. The front half of the length of the cephalothorax is nearly 

 wholl}'^ brow^n or fuscous, contrasting with the yellower hind part. 

 On the latter, nearly in a line with the hind-angles of the thorax, are 

 two very conspicuous round white spots (of the nature of the discal ones 

 in spencii^. They are distant from one another by about \ of the width 

 of the thorax, and between them is a cluster of excessively^ minute 

 pale dots. 



In North Wiltshire in one piece of bank I found mosst of the 6 

 Halictus tumulorum stylopized in August of several years (1886-90), 



g2 



