LIST OF ILLUSTRATIONS XIII 



Page 



5. Distribution of Diaptonnis minvhis Lilljeborg, D. mississ'ippiensis 



Marsh, D. novamexicanus Herrick, D. nudus Marsh, and D. tyrelli 

 Poppe 13 



6. Distribution of Diaptomus oregonensis Lilljeborg, D. viarshi Juday, 



D. (enuicaudatus Marsh, and B. piscinae Forbes 15 



7. Distribution of Diaptomus reighardi Marsh, D. coloradensis Marsh, 



and D. saltillinus Brewer 16 



8. Distribution of Diaptomus sanguineus Forbes, D. pallidus Herrick, 



and D. lintoni Forbes 17 



9. Distribution of Diaptomus shoshone Forbes and D. sicilis Forbes 18 



10. Distribution of Diaptomus siciloides Lilljeborg 19 



11. Diaptomus spatidocrenatus Pearse, fifth left foot of male, X 424 20 



12. Distribution of Diaptomus stagnalis Forbes, D. signicauda Lilljeborg, 



and D. washingtonensis Marsh 21 



13-16. 13. Diaptomus stagnalis Forbes, terminal segments of right an- 

 tenna of male; X 307. 14, D. stagnalis Forbes, fifth foot 

 of male; X 109. 15, D. stagnalis Forbes, fifth foot of female; 

 X307. 16, D. stagnalis Forbes, showing wings of last 

 cephalothoracic segment of female; X 55 22 



A REVISION OF THE BEETLES OF THE TENEBRIONID TRIBE USECHINI, 

 WITH DESCRIPTIONS OF A NEW GENUS AND NEW SPECIES 



By Frank E. Blaisdell, sr. 



1. Diagrams showing relation between the fifth and seventh costate 



intervals of the elytra in Usechus. a-a, Summit of the apical de- 

 clivity; A, lacerta Motschulsky; B, horni, n. var.; C, santaclarae, n. 

 var. ; D. trinitatis, n. var. ; E, nucleatus Casey 4 



2. Usechimorpha barberi. a, Head fully extended as seen from beneath; 



b, antenna, basal joint concealed by the genial plate 10 



A NEW SPECIES OF TREMATODE WORMS BELONGING TO THE GENUS 

 HaSSTILESIA from RABBITS IN TEXAS 



By Asa C. Chandler 



1-4. 1, Hasstilesia texensis; X 83. 2, Cross section of same through trans- 

 verse portion of intestinal ceca; X 166. 3, Cross section of same 

 through posterior part of acetabulum and anterior portion of 

 cirrus pouch; X 166. 4, Cross section of same just anterior to 

 genital openings at level of Laurer's canal; X 166 4 



Two NEW SPECIES OF PLOYCHAETOUS ANNELIDS FROM THE ARGEN- 

 TINE COAST 



By A. L. Treadwell 



1-6. Halosydna grisea. 1, Anterior end X 10; 2, Elytron X 9.5; 3, Para- 

 podium X 7.5; 4, dorsal seta X 85; 5, Dorsal seta X 85; 6, ventral 

 seta X 85. Figs. 7-12. Leodice argentinensis. 7, Anterior end X 

 10; 8, parapodium X 27.5; 9, compound seta X 250; 10 Pectinate 

 seta X 250; 11, maxilla X 10.5; 12, mandible X 10.5 3 



