JUNE 19, 1923 PROCEEDINGS: ENTOMOLOGICAL SOCIETY 261 
1. The true larval head has been invaginated to form a prepharyngeal part 
of the larval alimentary canal. The functional part of the larval head is a 
mere remnant of the original head. 
2. The buds of the imaginal head are carried into the thoracic cavity by the 
involution of the larval head. 
3. The cephalopharyngeal skeleton of the larva is a chitinization in the true 
larval pharynx, in the walls of the invaginated head, and in the pouches of 
the latter. 
4. The mouth hooks of the larva are located in a part of the invaginated 
larval head which was either the back part of the original head, or the neck. 
They appear to be special cuticular larval organs moved by special muscles. 
No evidence of their mandibular nature has yet been produced. 
5. The dorsal spiracles of the larva and pupa are special breathing organs 
secondarily developed in connection with the dorsal longitudinal trunks of the 
tracheal system. The spiracles of the adult first appear on the puparium, 
and are developed in connection with the lower tracheal trunks. The two 
sets of spiracles are entirely independent of each other. 
The larva molts inside the puparium, casting a fourth skin which remains 
as an envelope about the pupa, unbroken until the fly emerges. The fly 
leaves both the pupal skin and the prepupal or fourth larval skin inside the 
puparium. 
7. The pupa obtains air through the larval tracheal trunks attached to the 
anterior larval spiracles of the puparium, these trunks being ruptured inside 
the fourth larval skin a short distance back of the spiracles. 
8. The imaginal buds of appendages belong in all cases to the pupal stage. 
They may secondarily begin their development in early larval stages or in 
the embryo, but only in cases where the external larval appendage is entirely 
gone. 
Second paper: Cart Hernricu, A reviszon of the North American moths of 
the subfamily Eucosminae of the family Olethreutidae. Pierce’s paper opens a 
new system of classification. In this genitalia take the place of the old wing 
venation type of classification. In time all species will be described from the 
male genitalia. 
_ Notes: A. N. CauprE.u spoke of the collection of Grylloblatta campodeiformis 
Walker in California by H. 5. Barber. 
Dr. Scuwarz exhibited two specimens of Mylabris cichori L. and said this 
is a beneficial species, being used for medicinal purposes. ‘This species is often 
eaten when the Chinese want to commit suicide. 
Dr. Aupricu exhibited a photograph of a group of Dipterists taken in 
Boston at the recent meeting in December 1922. 
J. C. BripwELu presented the following three notes: 
1. The habits of Bruchus bixae. 
In 1820 Drapiez described a species of Bruchus from Brazil which he be- 
lieved bred in the seeds of annatto and called it Bruchus bixae from the generic 
name of the host plant, Bixa orellana. Since many old specific names of 
Brucidae based on plant names were in error and this record of a Bruchus in 
this plant so far removed from the legumes in its natural relationships and in 
the nature of the seeds and pods has never been confirmed, it has been a matter 
of interest to find what seems to be this species bred from this host plant 
collected by Dr. Schwarz in Panama. In this material was a considerable 
lot of the capsules and seeds of Bixa infested by Bruchus bixae. The adult 
Bruchids slip in between the partly opened valves of the pod to oviposit 
upon the seeds in a sheltered position much as its allies B. pruininus and 
