HYMENOPTERA. 45 



formed by Hipsoides bipars. In this instance each moth escapes by 

 an opening made by itself (269). 



On the west side of the gallery are three cabinets of British 

 Lepidoptera. The two larger ones contain the collection of cater- 

 pillars prepared by the Rt. Hon. Lord Walsingham, and presented 

 by him. The next cabinet contains the collection formed by the 

 late William Buckler, the author of "The Larvee of the British 

 Butterflies and Moths," published by the Bay Society. It was 

 presented to the Museum by Robert Newbury, Esq. 



The Rhopalocera are divided into five principal families, the Table- 

 characters by which these may be recognised are explained by a case 

 series of labels, drawings and specimens set out in a tabular form in 

 table case 47. 



A small series of other butterflies will be found in the cabinets 

 at the east side of the gallery. 



Order HYMENOPTERA. 



The Saw-flies, Ichneumons, Ants, Wasps and Bees belong to this 

 Order. 



They have complete metamorphoses. The perfect insect has the 

 head free, with slender attachment to the prothorax. The thorax is 

 compact, the prothorax small, the mesothorax large. They have four 

 wings with few veins ; the hind pair united to the front pair by a 

 series of hooks (except in some minute species). The basal segment 

 of the abdomen is in varying degrees more closely united to the 

 thorax than to the following segments, and in the majority the 

 communication between the first and second segments is by a narrow 

 neck or waist as in the hornet. The tarsi have five joints, except in 

 some minute parasitic species. 



They are classed in two great divisions :— 

 I. Hymenoptera Terebrajsttia, in which the legs have a 

 double trochanter. 



II. Hymenoptera Aculeata in which the legs have a single 

 trochanter. 



These are further divided into fourteen principal families. The 

 characters by which these may be recognised are explained by 

 specimens, drawings and labels arranged in a tabular form in 

 Table-Case 53. ca a se 53. 



In the second half of the same case are some examples of 

 Saw-flies. The metamorphoses of the common Currant Saw-fly are 



