388 SELECTED NOTES. 



EXPLANATION OF PLATE XXII. 



Fig. 1.— Female. 1 oh., the superior; 2 an., the inferior antennse ; 

 2 mxjj.y the second maxillipede ; 1, 2, S, 4, 5, feet ; e.r., egg 

 receptacle ; sjj/i., spermatophores attaclied to the abdomen ; 

 h., heart; or., the ovary; ova, the lateral mass of ova; 

 st. , stomach. 



,, 2. — Male. The lettering is the same except t., the testis. 



,, 3. — Eye. Lateral view. 



,, 4. —Spiral marking on carapace. 



,, 5. — Egg receptacle ; front view. 



,, 6. — Eye ; front view. 



,, 7. — Spermatophore, nearly empty. 



,, 8, — Ditto, full (in the body of the male). 



,, 9. -Ditto, half empty, s, The sperm sac. (Figs. 7, 8, 9 are not 

 drawn to the same scale.) 



,, 10, — Portion of ovary. 



„ 11.— Testis. 



,, 12. — Abdomen, a., anus (male). 



,, 13. — Consolidated joint of male antenna, with muscle. 



,, 14. — Spermatozoa. 



Drawn by A. Hammond. 



Larva of Corethra plumicornis may in the spring be found in 

 great abundance in our ponds, and forms an object of surpassing 

 beauty under the microscope. It is a gnat of the family Tipulidoi, 

 not Culicidce, and the change of form from larva to pupa is very 

 marked and interesting, the former swimming in a horizontal 

 position after the manner of a fish ; whereas, the latter assumes 

 an upright position and moves in jerks upwards. The beautiful 

 fan of hairs terminating the body in the larva is replaced in the 

 pupa by a number of plates resembling the tail of the Cray-fish, 

 and in this latter state the air-bladders, which serve in part to 

 maintain the horizontal position of the larva, have quite disap- 

 peared, unless it be the two front ones, over which the head 

 and thorax of the pupa seem to be supported. E. Bostock. 



Pupa of Corethra plumicornis.— In its larva stage this is the 

 well-known " Phantom Larva." The most interesting features in 

 the pupa mount are the respiratory tubes, and the very graceful 

 tail (? rudimentary wings). I can obtain no information as to the 



