Api. 15, 1925 
Ascaridia lineata, a Parasite of Chickens 
765 
caridia per spirillum) is variable with 
respect to the ventral papillae, or 
whether under the name Ascaridia 
perspicillum two or more species have 
been confused, must be left an open 
question. So far as concerns the 
arrangement of the papillae on the tail 
of the male in specimens of Ascaridia 
from chickens in the United States and 
from other localities that have been 
examined by the present writer, they do 
not correspond to any of the patterns 
described for A. perspicillum, but agree 
with that of another species, namely, 
A. lineata. 
ASCARIDIA LINEATA (SCHNEIDER, 
1866) 
Schneider (13) describes Heterakis 
lineata from the intestine of the chicken 
from Brazil in the same paper in which 
he discusses the identity of Heterakis 
perspicillum and H. inflexa. Schneider 
differentiates II. inflexa ( H. perspicil¬ 
lum) from H. lineata on the basis of the 
structure of the lips as well as on the 
basis of the number of papillae on the 
tail of the male. He states that H. 
inflexa has 3 dentigerous ridges on 
each lip, the first 2 being round and the 
third (most posterior) being quad¬ 
rangular, whereas H. lineata, according 
to this writer, has only 2 dentigerous 
ridges, the second ridge being very 
small. As far as concerns the papillae 
on the tail of the male, Schneider 
figures 10 papillae for H. lineata 
(fig. 4), the last group of papillae in the 
region of the tip of the tail consisting 
of 3 pairs, 2 lateral and 1 ventral, as 
compared with only 2 pairs of lateral 
papillae in H. inflexa. The remaining 
papillae, according to Schneider’s fig¬ 
ure, correspond in number and posi¬ 
tion to those of H. inflexa. 
Fig. 4 .—Heterakis lineata (after Schneider, 1866) 
Other records of the occurrence of 
Ascaridia lineata besides those given 
by the present writer are as follows: 
Von Linstow (7) records and figures 
Heterakis lineata from the duck from 
Turkestan. The number and arrange- 
19978—2ot 
ment of the papillae as figured by Von 
Linstow correspond accurately with 
those of Schneider, although there are 
two discrepancies, namely, as regards 
the elongation of the first ventral 
papilla, which is figured as transversely 
flattened by Von Linstow (fig. 5), 
whereas Schneider figures it as spherical 
in shape. As regards the second 
lateral papilla, Von Linstow figures it 
as directed laterally, whereas Schneider 
figures it as directed ventrally. 
Fig. 5 .—Heterakis lineata (after Von Linstow, 1883) 
Von Linstow (8) records Heterakis 
inflexa from the chicken, but from 
his description of the papillae, in which 
3 pairs are enumerated in the region 
of the tip of the tail, 2 being lateral 
and 1 ventral, it may be taken for 
granted that he was dealing with 
Ascaridia lineata. 
Wolffhiigel (18) records Heterakis 
lineata from Switzerland from the 
chicken and the duck, but he records 
H. inflexa (Ascaridia perspicillum) 
only from the grouse (Tetrao urogallus). 
Travassos (16) records and figures 
Ascaridia lineata from chickens in 
Brazil, the type locality of this species. 
His drawing of the tail of the male 
(fig. 6) shows a perfect agreement with 
that of Von Linstow (fig. 5) as to 
number, arrangement, and . direction 
of the papillae. 
Fig. 6 .— Ascaridia lineata (after Travassos, 1913) 
6 
