59 



Exhibitions. 



Mr. Stevens exhibited two specimens of Petasianubeculosa, which had that morning 

 emerged from the pupae : he had reared the larvae from eggs received from Perthshire, 

 and the insects had passed two winters in the pupa state. 



Mr. Stevens also exhibited some butterflies, chiefly Pieridae, sent from Siam by 

 M. Mouhot, and some beautiful Micro-Lepidoplera, taken by Mr. Diggles at Moretou 

 Bay. 



Mr. Douglas exhibited a box containing 1300 specimens of Coleoptera, taken 

 during the last month, chiefly in the neighbourhood of Lee, but a few were from 

 Hammersmith Marshes and Darenth Wood, amongst them were the following : — 



Stenus sohitus. Slenolophus exiguus 



„ pubescens Gyrophaena lucidula 



Sunius intermedius Euryusa laticollis 



Calodera lElhiops Homalola flavipes 



„ nigrita Thiasophila angulata 



„ riparia Quedius brevis 



Phloeopora reptans Sapiinus piceus 



Sericoderus lateralis Dendrophilus pygraseus 



Oxypoda n. sp. ? 



Found in 



nests of 



Formica 



rufa. 



Mr. Douglas also exhibited a monstrous species of Pulex found in grass at the 

 margin of a pond, and some larvs, supposed to be those of Trinodes hirtus, found under 

 loose bark of oak, also a specimen of Rhyzuphagus politus, Hellw., Fab., a species new 

 to Britain, taken by sweeping in a ditch at Lee, in June. 



Mr. Westwood exhibited a drawing of the larva of a species of the Dipterous 

 Genus Thereva, remarkable for the anomalous development of the abdominal seg- 

 ments which were comparatively of so large a size, each being also transversely 

 divided by an impression that there appeared to be double the usual number of joints, 

 which added to the head, three thoracic segments (of the usual size) and the anal 

 segment give the appearance of twenty-one segments, being eight more than 

 the usual number ; the eight abdominal segments being as it were duplicated, 

 the alternate ones presenting a minute lobe on each side : the head is extremely small 

 and dark-coloured, and the whole insect has the appearance of an elongated wire- 

 worm. He had received it from Mr. Milford, who had found it to be carnivorous, 

 feeding on the pupse of Alcucis pictaria. It has also been found to have destroyed 

 several pupae of the Sphinx Ligustri. No previous indication of its carnivorous habits 

 had been recorded, nor had the peculiar structure of the abdominal segments been 

 previously described. 



Mr. Westwood also exhibited three species of insects recently received by him from 

 Mr. Neitner at Ramboddo, in Ceylon, which have been found by that gentleman to 

 be injurious to the coff'ee planUitioiis. These consist of a species of Coccidte 

 {Lecanium Cojfece) the scales of which infest the leaves in immense numbers? 

 a minute moth, which Mr. Stainton thinks is referrible to the genus Gracilaria, and 

 distinct from the Elachista coffeella of Guerin, which appears to belong to the genus 

 Bucculaliix; the larvae of this little moth mine the leaves of the coff'ee, as do also 

 the larvae of the third insect, a minute species of Muscidae, which Mr. Haliday, 

 to whom it had been referred, regards as belonging to the genus Agromyza. 



Mr. Westwood also exhibited various insects which had been found to be injurious 

 to books, in the Bodleian Library, where a carulul hunt alter hook-worms is now 



