II. — Haemogregarine of Mus norvcgicus. 
This haemogregarine resembles morphologically H. mûris 
Balf. and Hepatozoon perniciosum Miller, lt has been found 
in several specimens of M. norvégiens taken in the City of Pa¬ 
nama. 
The parasites were seen in mononuclear leucocytes in the peri- 
pheral blood, spleen, liver and bone marrow and présent no dif¬ 
férences from those described by Miller in white rats in Was¬ 
hington, D. C. The grey rats were infected with Lelaps echidni- 
nus as well as Onithodoros talaje larvae, Amblyomma, sp., 
Xcnopsylla cheopis, Liponyssurs and Anthocoridae sp. 
III. — Haemogregarine of Iguana tuberculata. 
This parasite was not often found and was only sparsely scat- 
tered through the blood stream. Forms of several âges were seen 
in the peripheral blood at the same time (i). The larger forms oc- 
cupied a portion of a red blood cell which sometimes appeared 
shrunken and pointecl but was not dehaemoglobinized. The smal- 
ler forms are ovoid and irregular in outline with achromatic cen¬ 
tral portions. The larger parasites are curved around the nucléus 
of the red blood cell. No pigment and no vacuoles were detected. 
The chromatin mass in the largest forms is placed in the center 
of the parasite, differing in this respect from many haemogrega- 
rines. 
Most of the iguanas taken were found to be infested with Am¬ 
blyomma dissimile near the dewlaps and around the internai as¬ 
pect of the thighs, near the vent. .Several nymphs and one young 
female were dissected and examined for haemogregarines, but no 
positive évidences of a developmental cycle were detected. 
IV. — Other Haemogregarines of the Reptiles. 
Haemogregarines were found in the following snakes. 
Epicrates cencris. — Every one of three specimens of this snake 
contained numerous haemogregarines. They were found in adult 
specimens and in the very young. 
Boa imperator. 
(i) L’hémogrégarine de I. tuberculata a été décrite par A. Laveran et 
Nattan-Larrier sous le nom de H. iguanae (Soc. de Biologie, 20 jan¬ 
vier 1912). 
