120 



apid^;. 



the flagellum ferruginous, a black dot on four or five of the middle 

 joints, and sometimes a narrow black line on the scape behind. 

 Thorax — the collar on each side, the tubercles, a line on the breast 

 in front, the tegulse, scutellum, and sometimes a minute dot be- 

 neath it yellow ; wings as in the female ; the coxse and trochan- 

 ters black, the anterior pair yellow in front ; femora ferruginous, 

 their extreme base black beneath ; the knees and all the tibiae and 

 tarsi yellow, and more or less stained with ferruginous. Abdomen 

 as in the female ; in rare instances there is an interrupted yellow 

 line on the first segment. B.M. 



This is a very local insect ; it appears in July and is the parasite 

 of Halictus rubicundas and H. leucozonins. It is also said to infest 

 colonies of Andrena fulvicrus. It has been found near Darenth, and 

 very abundantly at Eastbourne and in Sandown Bay, Isle of Wight ; 

 it has also been taken at Kemp Town, Brighton. 



10. Nomada baccata. 



N. ferruginea, capite thoraceque nigro variegatis, abdominis seg- 

 mentis albo maculatis. 



Nomada baccata, Smith, Zool. ii. 604 $ 2 I B ees Great Brit. 121 ; 



Nyland. Notis. ur Stilish, pro Faun, et Flo. Fenn. ii. 230. 

 Nomada laeta, Thorns. Opusc. Ent. 98 ; Hym. Scand. ii. 188. 



Female. Length 3 lines. — Head, the ocelli enclosed in a transverse 

 black macula ; in front of the anterior ocellus a black macula 

 descends to the insertion of the antennas, and from each an abbre- 

 viated black line passes down to the base of the clypeus ; the cheeks 

 black. Thorax — three longitudinal black lines on the mesothorax, 

 and a central one runs down the metathorax ; an oblique black 

 stripe runs from the posterior wings to the coxae of the intermediate 

 legs ; the posterior legs have sometimes their base more or less 

 black beneath ; wings subhy aline, iridescent, with their apical mar- 

 gins slightly clouded. Abdomen — at the base above an irregular 

 transverse black line, frequently forming the letter M ; the second 

 segment has, on each side, a large subovate white macula, somewhat 

 pointed inwardly ; the third segment a smaller macula laterally, 

 the fourth a transverse line, slightly interrupted in the middle, and 

 the fifth a large square white macula. B.M. 



Male. Length 2 J -3 lines. — Head and thorax black; the clypeus, 

 labrum, mandibles, and scape in front white ; the scape black 

 behind ; the flagellum red, the joints having a fuscous line above, 

 darkest towards their base ; the head and thorax above have a thin 

 hoary pubescence ; on the thorax beneath it is shorter but more 

 dense ; two spots on the scutellum and the-teguhe rufo -testaceous; 

 the legs of a paler red than in the other sex ; wings as in the female. 

 Abdomen pale rufous, the extreme base black ; two minute white 

 spots on the first segment, frequently obliterated ; the second has 

 two large spots as in the female, the following segments have elon- 



