1933 ] 
New Genus of Phoridx from Peru 
107 
due to the approximation of the very minute hairs on the 
surface of the wing and is quite distinct from any thicken- 
ing or darkening of the wing membrane. 
In another family of Diptera, an African species of 
Stenobasipteron bears a bulla or swelling near the base of 
the second longitudinal vein in the first basal cell. This is 
mentioned by Dr. Joseph Bequaert 1 , who called my attention 
to the reference and also kindly allowed me to examine a 
specimen of this rare species (S. wiedemanni Licht) . The 
spot lies close to the radius just below the fork which gives 
rise to R 2 + 3. It is darker in color than the remainder of the 
wing surface due to a slight thickening and denser patch 
of hairs. Above it is convex, below concave and not so 
clearly defined as Lichtwardt has figured it in his extensive 
paper . 2 
The bulla is distinct in both sexes, but much more promi- 
nent in the male. Certain other species of Stenobasipteron 
show the same structure, but to a very slight degree. 
In Hymenoptera certain species of Ichneumonidse of the 
subfamily Ophioninse, particularly Henicospilus and sev- 
eral related genera bear on the wing membrane in the disco- 
cubital cell one or several chitinized spots or “maculae.” 
These are apparently structureless depositions of yellow or 
brown material seemingly similar to the veins, except that 
they are not linear, appearing as small quadrate comma- 
shaped or irregular areas. Their presence is usually asso- 
ciated with abnormalities of the wing surface surrounding 
them, involving the disappearance of the hairs which nor- 
mally occur on the wing surface and sometimes marked 
changes in the course of the nearby veins, although the 
loss of hairs and the thickening and bending of veins occurs 
in a number of related forms where chitinous maculae are 
not developed. The chitinous thickenings may be either 
bare or clothed with hairs. Related Hymenoptera of the 
family Braconidse belonging to Gyroneuron and allied 
genera exhibit somewhat similar abnormalities in the 
iPsyche, Yol. 32, p. 17 (1925). 
2 Beitrage zur Kenntnis der Nemestriniden, Dents. Entom. 
Zeitschr, 1909, pp. 113-127; 507-514; 643-651: 1910, pp. 371-388; 
589-624. 
