222 ANNALS OF SCOTTISH NATURAL HISTORY 



top than is the case with species which are not known to fly 

 at night. Very noteworthy, also, is the fact that the ocelli, 

 in these nocturnal or quasi-nocturnal species, are much larger 

 than usual, as well as being of a light glassy brown colour. 

 As examples of these two peculiarities we have the Ichneumon 

 tribe OpJiionini> e.g. OpJiion and its ally Eniscospilus, which 

 are well known to be attracted by artificial light at night, and I 

 have also seen Ophion at "sugar" placed as bait for moths at 

 night. It is the same with the Paniscini, which are identical 

 in coloration, uniformly fulvous, as well as the Braconid 

 tribe Zeleini; e.g. I have known Zele to come to lamplight 

 at night. Then it is known that the large ants of the genus 

 Dorylus (all of them of a uniform fulvous colour) come to 

 light and have been seen flying at night in large numbers. 

 A correspondent sent me from Java a number of a large 

 species of Dorylus, which caused great alarm by flying in 

 huge numbers into the fire, besides hovering almost in clouds 

 round the lighted lamps. Then among bees we have the 

 large Indian Xylocopa rufescens, which has been found on 

 flowers at night ; it is of a uniform golden brown colour, and 

 its ocelli are larger than they are in most of its congeners. 



From the fact that the ocelli are larger with the nocturnal 

 than they are with diurnal species, one might fairly conclude 

 that the simple eyes aid the compound ones in enabling the 

 insect to see better in darkness. 



II. ALPINE HYMENOPTERA. 



The number of Scottish Alpine Hymenoptera, so far as I 

 know, is not large. Among the Saw-flies we have Nematus 

 breadalbanensis, Cam., which is found on the mountains (the 

 Breadalbane and Ben More, Mull) at a height of 3000 feet 

 and upwards ; N. clibrichelliis, Cam., which I captured on the 

 top of Ben Clibrich, Sutherlandshire (3180 feet). Probably 

 N. carinatus, Htg., and N. lativentris, Thorns., are also 

 Alpine species, having been found on the Braemar mountains, 

 but I have no note of the elevation at which they were taken. 

 Polyrhembra tenebriossa, Gr., I have taken on flowers at a 

 height of about 3000 feet on Ben Lawers ; Phygadeuon 

 fuinator, Gr., at 2000 feet, also on flowers. The curious 



