ADDENDA. 
ow) Page 22, Life Cycle, LuciL1a MACELLARIA. 
The life of the adult fly is short, varying from two 
to six weeks. The flies feed on various kinds of 
refuse and to some extent upon the nectar of flowers. 
When food is not at hand and the temperature is high 
they may die in one to two days. Eggs are laid in 
batches from one to four days apart and one female 
may lay as many as eight batches totalling over a 
thousand eggs. 
VY Page 90, Life History, SprropTERA SCUTATUM. 
The eggs of S. scutatum present in the feces of cattle 
infested with the adult parasite hatch out when swal- 
lowed by insects of various species. The larvae thus 
released from the eggs pass into the body cavity and 
reach the final larval stage in about a month. In 
this stage the larva is coiled into a spiral and is in- 
closed in a capsule about 0.5 in diameter. 
Cattle feed contaminated by insects containing these 
larvae transmit the disease. Spiroptera scutatum lar- 
vae have been found by Ransom and Hall in various 
species of dung beetles collected from manure. 
“Page 90, Nematoda. (insert at last of paragraph). 
Nematodes of the digestive tract live at the ex- 
pense of the walls of the digestive tract in all cases, 
and not on food in the lumen. According to Garin, 
some worms as the Heterakis papillosa live on mucous 
and intestinal juices; others as the Oxyuris, Ascaris 
suilla, A. megalocephala live on epithelial cells; others 
Habronema microstoma live on lymphatic cells and 
lymph; others as the Strongiles, Anchylostoma, and 
Trichuris live on blood. The attack on the mucosa 
may be mechanical as with teeth in the case of the 
hook worms, or chemically by digestive secretions, as 
in the case of the Trichocephalus. 
