54 Annals Entomological Society of America [Vol. Ill, 



Organs of Reproduction? At about the termination of the 

 Malpif,^hian tubules, and below the same is a pair of elongate, 

 fusiform, transparent bodies terminating anteriorly and poster- 

 iorly as slender tubes. These bodies were not observed in all 

 the larvae examined. They are probably the developing repro- 

 ductive organs. 



Xen^oits System. Plate VIII. Figs, i and 2. The nervous 

 system is more specialized than in many other dipterous larvae, 

 in that there is considerable cephalization of the ganglionic chain. 

 This chain is composed of ten distinct ganglia, exclusive of the 

 sub-rx'sophageal one. and extends from the middle of segment 2 

 to the middle of segment 4. It is supported chiefly by the con- 

 verging branches of the lateral longitudinal tracheae, while the 

 brain is kept in place and aerated largely by the stouter pair 

 of tracheal branches, F,, which arise from the main dorsal system. 



The brain or supra-oesophageal ganglion consists of two lobes 

 of larger size than the rest and broadly joined to the sub-oesopha- 

 geal ganglion, the commissure not being apparent. The oesopha- 

 gus passes between these two ganglia, as probably also the dorsal 

 vessel, the salivaiy glands running on either side. At least one 

 pair of nerve cords from the brain, and two or more from the sub- 

 oesophageal ganglion proceed anteriorly, and each of the ganglia 

 of the chain sends out several nerves, some of which inin along 

 the lengths of the supporting tracheae. The last ganglion of the 

 chain is more elongate than the others. 



Very little could be made out of the sympathetic ner\-ous 

 system, and the paired ganglia. C, Figs, i and 2, PI. VIII, arising 

 posteriorly from the lobes of the brain are all that I feel sure of. 



Musculature. The muscles were not studied though it was 

 observed that they were numerous and well developed, a condi- 

 tion quite necessary in such a restless insect. Several muscles 

 are fastened to the chitinous prongs of the head skeleton, and a 

 number of large muscles radiate from the caudal cleft, being 

 fastened to the body wall. Thus the larva is enabled to retract 

 quickly its caudal end into the resinous mass if disturbed. 



Adipose tissue. This is very well developed, so much so in- 

 deed that it obscures in a great measure the different visceral 

 systems. The fat body is of a dirty yellowish-white color, and 

 consists of a loose network of lobes with long meshes, and is con- 

 tinuous throughout the body, thickest below the middle, thence 

 tapering to either extremity , extending anteriorly to the base of the 



