236 MR. R. SHELFORD ON MIMETIC INSECTS AND [Nov. 4, 
belonging to the most diverse orders, such as Hemiptera, Diptera, 
Lepidoptera, and Coleoptera. 
The model is one of those reddish-ochraceous Braconids, of 
which there are many representatives in Borneo, all being more 
or less common, ‘This particular species, with a conspicuous black 
stigma on the fore wing, is eminently a mountain form, as the 
numerous specimens in the Sarawak Museum bear witness. 
Mt. Matang at any elevation above 1500 feet is its favourite 
haunt, but | have never taken it below that altitude. The mimic, 
which was recently described by Mr. McLachlan, was captured 
in the month of August also on Mt. Matang, at an altitude of 
2500-2800 feet. It, too, is reddish-ochraceous, whilst each wing 
bears a black stigma, those on the fore-wings being slightly more 
conspicuous than those on the hind- wings ; the sides and ventral 
surface of the abdomen are pure white (in the fresh condition), so 
that when the insect is seen in profile its somewhat bulky body 
appears to be reduced approximately to the size of the body of 
its model; as, further, the model also has the ventral surface 
of the abdomen coloured white, the resemblance between the two 
insects is still greater (compare Plate XIX. figs. 22 & 23). This 
method of producing a thin-bodied or wasp-waisted effect by white 
patches is by no means uncommon amongst insects; I shall be 
able to give further examples of it in this paper (vide infra, 
pp. 238, 241), and at present need only refer to the well- known 
Soudanese Locustid Myrmecophana fallax ( Br.) mimicking an ant, 
and to the Moth Pseudosphex hyalina which mimics a Sphex. 
ii. Mimic. Mantispa sp. Plate XIX. fig. 27. 
Model. Polistes sagittarius (Sauss.). Plate XTX. fig. 26. 
The Wasp, P. sagittarius, is an extremely common species and 
is rendered highly conspicuous by reason of a red band on the 
second abdominal segment; the rest of the body is black, varied 
on the head and thorax with a rich red-brown; the wings are 
fuscous, becoming flavo-hyaline outwardly. The mimic is black 
with the second and third abdominal segments red, the width of 
these two segments closely corresponding with the large second 
abdominal segment of the wasp; the wings are hyaline, but largely 
shaded with fuscous at the base and along the costal margins and 
flavo-hyaline at the apex (compare figs. 26 & 27). A closely allied 
species from Assam is in the Hope Collection at Oxford, with the 
MS. name of J. nodosa (Westw.). The specimen belonged to the 
Cantor Collection. 
Mimic. Mantispa sp. Plate XIX. fig. 25. 
Model. Polistes sp. near diabolicus (Sauss.). Plate XIX. fig. 24. 
The general colour of the Wasp is reddish-brown, the abdomen 
is covered with a fine silky pubescence golden in colour; this 
1 Ent. Month. Mag. (ser. 2) vol. xi. 1900, pp. 127-128. 
[8] 
