i66 HYMENOPTERA ACULEATA. 



proportion to the second, and to its own length, the punc- 

 turation of the second and following segments is larger and 

 more distinct, and only the first three segments bear yellow 

 bands, which are wider than those of picius, that of the 

 basal segment eometimes dilated at the sides ; the tibiae in 

 both sexes are unspotted, and reddish testaceous, or more 

 or less tinged with that colour. 



L. 10-13 mm. 



Apparently chiefly a maritime species. Lifctlehampton ; 

 Worthing ; Hay ling Island ; Deal ; Heme Bay. Walmer ; 

 Lundy Island; (»S'?«i^/i). Lowestoft ; (Ifor/ce). Hastings; 

 (Frishy). Gloucestershire ; {Perkins). Norfolk ; (Bridg- 

 maii). Lancashire and Cheshire ; (GarcZjie?-). Loch Ran- 

 noch, Isle of N. Uist ; (Dale). Scilly Isles; (Marshall). 

 Land's End; (Marquand). 



0. trifasciatus, Oliv. — This species, allied to trimar- 

 ginatus in the form of the abdomen, and the number of its 

 bands may be distinguished by its longer thorax, which in 

 the ? is nearly twice as long as wide ; by its yellow tibise, 

 of which the intermediate and posterior pairs are black or 

 dusky at the extreme base, and widely black at the apex 

 and inwardly in the ? , or bear a black spot inwardly, spread- 

 ing from the apex in the c?, and by the more or less dusky 

 tarsi iu both sexes, these in the ? sometimes nearly 

 black ; the anterior tibiae are also black posteriorly in both- 

 sexes. 



L. 8-12 mm. 



Chobham. Hastings; London District; {Sviitli). Land's 

 End; (Marquand). Colchester; (Rarwood). Glanvilles 

 Wootton ; Dorset; (Bale). Eugby ; [Morice). Norfolk; 

 (Bridgman). Gloucestershire; (Perkins). Lancashire and 

 Cheshire; (Gardner). 



Smith says it forms its burrows in old palings. 



0. parietinus, Linn. — Like trifasciatus in the colora- 

 tion of the legs, but with the bases of the tibise yellow ; it 

 is a much larger, more robust species, with all the coxsa 



