The sexual openings were found in the usual place; the ventral surface of the first abdominal segment, this being enlarged so as to do away with the second abdominal segment. The epigynum consists of a long epigastric furrow with a large lip-like opening near its median line. Just above this opening and on either side were small longitudinal creases. Prof. Dr. Friedrich Dahl places the external sexual organs of this family on the legs and in the Thelyphonidæ which is closely related. They are found in the second joint of the tarsus of the first legs. Careful study failed to find any trace of secondary sexual organs in _Trithyreus pentapeltis_. _Krayselin, Karl_ 1899 Das Tierreich. Scorpiones und Pedipalpi. _Cook, O. F._ 1899 Hubbardia, a new genus of Pedipalpi, Entomological Society Proceedings, vol. 3. _Comstock, John Henry_ 1911 The Spider Book, pp. 17-18. _Banks, Nathan_ 1900 Synopsis of North American Invertebrates. Am. Nat. Vol. 34. _Dahl, Dr. Friedrich_ 1913 Vergleichende Physiologie and Morphologie Der Spinnentiere. Jena, Verlang N. G. Fischer. (_Contribution from the Zoological Laboratory of Pomona College._) EXPLANATION OF FIGURES Fig. 1. Drawing of the upper side of a young Trithyreus pentapeltis Cook ×10. Fig. 2. Lower or ventral view of T. pentapeltis ×10. Figs. 3, 4, and 5. Various views of the caudal end of an adult T. pentapeltis. Much enlarged. Fig. 6. Labium. Much enlarged. Fig. 7. Maxilla. Much enlarged. Fig. 8. Mandible of Trithyreus. Much enlarged. Fig. 9. One jaw of mandible. Much enlarged. [Illustration: 1] [Illustration: 2] [Illustration: 3] [Illustration: 4] [Illustration: 5] [Illustration: 6] [Illustration: 7] [Illustration: 8] [Illustration: 9] Notes on Chalcid Flies, Chiefly From California A. A. GIRAULT The following descriptions are chiefly from specimens sent by the Department of Zoology of Pomona College. _Eusandalum californicum_ n. sp. _Female_: Similar in every respect to _coquillettii_ Ashmead except as follows: The hyaline cross-stripe between the fuscous cross-stripes of the forewing is distinctly narrower than either fuscous cross-stripe (broader than either in the other); the stylus of the abdomen is a little shorter than the ovipositor valves (their extruded portion), both equal in length in _coquillettii_. Otherwise the same. Antennæ 11-jointed, tapering, the club single and no longer than the pedicel, funicle 1 quadrate, 2 longest, elongate, somewhat compressed, over thrice the length of the pedicel. Types compared. A female from Claremont (C. F. Baker).