184 ENTOMOLOGICAL SOCIETY 



apply to the whole group Arthropoda. Mr. Schwarz agreed 

 with the ideas advanced by Mr. Howard, and stated that 

 arachnologists had affiliated with entomological societies largely 

 because they were so few in number, and because there were no more 

 nearly related associations of specialists. Dr. Riley said he had 

 been much interested in Dr. Gill's paper, and particularly in the 

 point brought out that the hind legs have apparently developed 

 into breathing organs, referring to the somewhat similar state of 

 affairs with Chauliodes and Eristalis, where anal pedal organs 

 had been modified into branchial organs. Mr. Hubbard ex 

 pressed himself as not surprised at the modification just men 

 tioned, since the modification of stylets into branchiae with larval 

 insects is common. He called especial attention to the larvae of 

 the Adephagous series of the Coleoptera and their possession 

 of branchiae which in related land forms are stylets. He referred 

 also to a similar state of affairs in the larvae of Amphizoa and 

 Pelobius. He prophesied that when the newly hatched larvae of 

 Coleoptera are well known it will be found that this change 

 takes place quite frequently. 



Mr. Hubbard exhibited specimens of the larvae, pupae, and 

 adults of a dipterous insect, determined by Mr. Coquillett as a 

 species of Drosophila, which he had found living in the larval 

 state in the mouth of the common land-crab on the Island of 

 Montserrat, B. W. I. He found the pupae of the same insect 

 on the inner side of one of the maxillary lobes of the crab. The 

 larva was rather remarkable in its side projections. 



Dr. Gill discussed the probable species of crab referred to by 

 Mr. Hubbard, concluding that it was Cardisoma quamhami. 

 Mr. Howard asked as to the normal food of these crabs, with a 

 view to determining the probable origin of this messmate habit 

 on the part of the Drosophila larvae. Mr. Schwarz asked for an 

 explanation of the rapid movements of the larvae in the crab's 

 mouth. Mr. Hubbard replied that it was a swimming movement, 

 assisted by the lateral projections of the larva. Dr. Gill pointed 

 out that these larvae were probably not stationed in the mouth of 

 the crab, but in the branchial cavity. 



Under the head of exhibition of specimens, Dr. Riley showed 

 a Curculionid which he found recently injuring certain aquatic 



