LIST OF ILI.USTIIATIONS XVIT 



New diptera or twq-winged flies in the United |States National 



Museum 



By J. M. Aldrich 



Fag* 



1. Male genitalia, a, Sarcophaga subaenescens, new species; b, Sarcophaga 

 placida, new species; c, Masicera arator, new species; d, Sarcophaga 

 morosa, new species • 25 



A RARE Cretaceous sea urchin Scutellaster cretaceus Cragin 



By John B. Reeside, jr. 



1. Hypothetical restoration of Scutellaster cretaceus Cragin, based on the 



type and a Miocene Scutella 2 



2. Comparison of arrangement of plates of (B) actinal side of Scutella 



subrotundata Lamarck with that of (A) Scutellaster cretaceus Cragin. . 3 



Chinese amphibians and reptiles in the United States National 



Museum 



By Leonhard Stejneger 



1. Phoxophrys grahami. Type U. S. Nat. Mus. No. 65500. 2X nat. 



size 40 



2. Eumeces pekinensis. Type U. S. Nat. Mus. No. 60683. 3Xnat. size.. 49 



3. Lygosaurus sowerbyi. Type U. S. Nat. Mus. No. 65375. 4Xnat. size-. 53 



4. Takydromus intermedins. Type U. S. Nat. Mus. No. 64437. 3Xnat. 



size 59 



5. Number of ventrals in Natrix piscator, N. percarinata, and N. annularis 



based on published records of 72 specimens 67 



6. Number of subcaudals in Natrix piscator, N. percarinata, and N. annu- 



laris 67 



On the occurrence op remains of fossil porpoises of the genus 

 eurhinodelphis in north america 



By Remington KeUogg 



1-4. Teeth of Eurhinodelphis bossi. Cat. No. 8842, U.S.N.M.X3. 1. 

 Anterior view of tooth. 2. Posterior view of a tooth. 3. Pos- 

 terior view of an anterior tooth. 4. Lateral view of a posterior 

 tooth, apex of crown missing 20 



Mineralogy and petrography op Triassic limestone conglomer- 

 ate METAMORPHOSED BY INTRUSIVE DIABASE AT LeESBURG, VIRGINIA 



By Earl V. Shannon 



1. Diopside. Habit of minute colorless crystals occurring in veins with 



datolite ._ 19 



2. Datolite. Small crystal showing common habit with apparently 



orthorhombic symmetry 21 



3. Datolite. Similar to Figure 2 but having some negative pyramids not 



represented by corresponding positive forms 23 



4. Datolite. Similar habit to Figure 3 but showing only positive hemi- 



pyramids 24 



5. Datolite. Crystal from a specimen on which all the crystals, like the 



one figured, are different from the prevailing habit at the locality. 

 Shows several unusual forms 25 



