210 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
In the published figure of H. mirabilis (Carriker, 1936, pl. 30, 
fig. 3), only one hair is shown at the outer edge of the mandibles, 
where four long, strong hairs are present in clay2 Guimaraes and Lane 
and dimorphus, new species. A reexamination of the type of mira- 
bilis shows three small pustules in a line posterior to the single hair 
shown in the published figure. Undoubtedly the hairs from these 
pustules have been lost, but they were certainly very much smaller 
than those in dimorphus, probably of the same size as the single hair 
shown in the figure. 
HEPTAGONIODES DIMORPHUS, new species 
HIGURES 25, 9g; 26, a, b 
Types.—Male and female, adults, from Zinamus tao weddell, col- 
lected by the author at Palmar, Dept. Cochabamba, Bolivia, on July 
12, 1937; in collection of author. 
Diagnosis—Male: There is a strong superficial resemblance be- 
tween the new form and agonus, but dimerphus is somewhat larger 
and differs very much in the proportions of the head and thoracic seg- 
ments, while the abdomen is practically the same, both in structure 
and measurements. The male genital armature is strikingly different, 
having the basal plate longer, the paramers nearly twice as long, and 
the endomeral plate more than twice as long, while the latter two are 
very much narrower and of very different shape. 
In some respects dimorphus resembles clayi Guimaraes and Lane,® 
but the genital armature is quite distinct, as well as the proportions of 
the head and thorax. 
The female of dimorphus differs from clayt (as figured by Kéler), 
in the size, proportions of head, and its shape, while the abdomen is 
much longer and narrower, with apical portion much attentuated. 
The shape of the head is nearer to Taschenberg’s figure of agonus 
than to clayz, but the abdomen is very much slenderer, while segment 
VI of abdomen has the paratergal plates separated medially (there 
are no tergal or sternal plates in this genus) by a considerable hyaline 
space, while in Taschenberg’s figure of agonus they are united. 
The new species is represented by two males and four females 
(including the types). 
Remarks.—In the male of diémorphus the lateral emarginations of 
the head resemble very strongly those shown in Piaget’s figure of his 
H, excavatus, having a very sharp point at the posterior edge of the 
emargination. 
®There is not the slightest doubt that Kéler (1938, p. 328) has described and figured 
H. clayi as H. agonus. The shape of head, chaetotaxy of head, and genital armature are - 
- exactly the same, while the specimen figured was taken from the same host as clayi 
(Tinamus solitarius). Dr. Hopkins has already called attention to this fact. 
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