430 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



with two apical tubercles bearing long bristles; ninth ventral short 

 quadrate with setigerous tubercles at apical angles; tenth apical, 

 dorsally covered by ninth, armed with a very long pair of approx- 

 imate bristles; tarsi consisting of single-jointed pads. 



Head apically emarginate, containing very peculiar internal 

 chitinizations. The mouth opening causes an etnargination of the 

 apex. This is braced by a ventral bridge which sends forward an 

 arm on each side of the mouth and also two similar arms backward. 

 This chitinization extends dorsally and forms an elliptical orifice 

 for the esophagus. Externally lying over this chitinization and ap- 

 parently connected with it is a four-pronged piece with at least 

 three of the prongs prominent when viewed from the side (illustrated 

 in pi. 67, fig. 3). The mandibles are also peculiar. They are at- 

 tached apparently to the anterior arms of the ventral bridge and 

 extend laterally almost to the eyes and have a long tooth extending 

 to the base of the head. The antennae appear to be three jointed and 

 are placed near the anterior margin about halfway between mouth 

 and ocelli. The second joint has a long lateral arista. The ocelli 

 are in three pairs, the anterior being immense in comparison to the 

 size of the head. The crystalline lens is convex and beneath it at 

 some distance are clusters of pigment granules. Two smaller ocelli 

 lie behind this as shown in figure 3, plate 67. 



Paratypes.— Cat. No. 21435, U.S.N.M. 



III. Superfamily XENOIDEA Pierce. 



Table of families. 



1. Male unknown. Female cephalothorax narrow and elongated with two 



pair of spiracles ; five genital tubes entering brood canal. Pai-asites of 



Heteroptera IV. CaUipharixenidae, new family. 



Males known. Female cephalothorax broader, with only a single pair 

 of spiracles 2 



2. Scutellum broadly rounded in front 3 



scutellum more or less broadly truncate, and pedunculate in front 4 



3. Scutellum shorter than praescutum ; postlumbian short, transverse ; anten- 



nae seven-jointed, third joint laterally produced, fourth joint short, fifth 

 to seventh joints elongate. Female unknown. Parasites of Formi- 



coidea Y. Mynnccolacklae Pierce. 



Scutellum longer than praescutum ; postlumbium at least half as long as 

 broad; antennae six-jointed, the third joint laterally produced. Female 

 cephalothorax broadly truncate or rounded at apex ; head almost one- 

 half as wide as metathorax at spiracles ; five genital tubes entering brood 

 canal. Parasites of Apoidea VI. Stylopidae Kirby. 



4. Praescutum as broad as mesothorax at base ; antennae five-jointed, the 



third joint laterally produced, fourth very short, fifth elongate. Female 

 cephalothorax with head not more than one-half as wide as metathorax 



at spiracles. Parasites of Apoidea VII. Hylecthridae Pierce. 



Praescutum not as broad as mesothorax at base ; antennae four-jointed, the 



