410 ME. E. SAUNDERS ON THE TONQ-UES OF THE 



a.r. Posterior renal arteries. 



hV. Allantoic bladder. 



hi]'. Orifice of the same, 



cV. Cloaca. 



d". Epidermal portion of the same. 

 cl"'. Oviducal recess of the same. 

 dv' . Caecum coli (or its probable homologue). 

 <^y". Appendix digitiformis. 



/. Longitudinal fold in roof of large intestine. 



i.l. Large intestine. 



i.s. Small intestine. 

 od\ Left oviduct. 

 od)' . Right oviduct. 



f. Pelvic girdle. 



sV. Stomach, cardiac sac. 

 sV. Stomach, pyloric sac. 

 v.i. Intestinal (spiral) valve. 

 v.ic. Ileo-colic valve. 



On the ToBgues of the British Hymenoptera Anthophila. 

 By Edwaed Satindees, F.L.S., F.E.S. 



[Read 17th April, 1890.] 



(Plates III.-X.) 



In Vol. XVII. of this Journal Mr. Travers J. Briant has ably 

 described the tongue of Aigis mellifica and its anatomy, and I 

 purpose in this paper to give descriptions of this organ in other 

 British genera of Hymenoptera Anthophila, accompanied with 

 figures carefully drawn from slides prepared by Mr. Enock, 

 whose skill in this direction is well known. At the present time 

 I know of no figures that, in any way, give an idea of the beauty 

 and complexity of structure which characterize the different 

 genera. The number and proportionate lengths of the joints of 

 the palpi and the general form of the so-called lingua have been 

 the only characters usually selected for generic determination, 

 whereas the form of the lora, suimentum, scales of the maxillcs, 

 smdi paraglossce afford additional characters quite as important, 

 as will be seen by the accompanying Plates. As a general 

 result from the study of these organs, it would appear that 

 there is a gradual modification of form from the short bifid 



