226 MISSOURI BOTANICAL GARDEN. 



Plate 19, r. Quatemalensis. 1, Flower, natural size; 2, pistil and 

 stamens, X 2 5 3 > sections of pistil at points marked, X 2 5 *> f ull y grown 

 but green fruit, natural size; 5, seed, X 2 - 



Plate 20, Y. baccata. 1, Flower, natural size ; 2, pistil and exceptionally 

 long stamens, natural size; 3, pistil (the upper part in longitudinal 

 section), and cross sections, X 2 5 4 > enlarging ovary, showing Prouuba 

 punctures, natural size; 6, cluster of fruits, perforated by escaping 

 Pronuba larvae (after a photograph taken near San Diego, Cal., by Parker 

 and Parker), reduced. 



Plate 21, Y. brevifolia, 1, Flower, at time of pollination, natural size; 



2, pistil in longitudinal section, and cross sections at points marked, X 2 ; 



3, Pronuba synthetica, X 3 5 *> oviposition of moth, natural size ; 5, head 

 of laden $?, X*0; 6, young larvae in developing fruit, reduced one-half; 

 7, ripened but rather small fruit, from which the larvae have escaped, 

 natural size. 



Plate 22, Y. filamentosa.l, Flower, natural size. r. elata.2, pistil 

 and stamens, and cross sections of pistil, X 2 ; 3, dehiscent capsule, per- 

 forated by escaping larvae, natural size. Y. glauca, var. stricta. 4, pistil 

 and stamens, and cross sections of pistil, X 2 6 > Pronuba yuccasella, 

 X3. 



Plate 23, Pronuba maculata, var. aterrima. 1, Laden 9, X 3 ; 2 > nead 

 of same, X 10 - Pronuba maculata. 3, laden , X 3 > aQ d venation of 

 wings ; 4, pollination. Hesperoyucca Whipplei. 5, flower, natural size ; 

 6, longitudinal section of pistil, and cross sections at points marked, 

 X 2 ; 7, stamen, adnate to base of petal, X 2 > 8, section of ovary punc- 

 tured in oviposition, X 2 > 9, small capsule, dehiscent through the false 

 septa, natural size. 



Unless otherwise stated, the plates were drawn by Miss Johnson, from 

 photographs or studies by the author, or are reproductions of photographs. 



Since the preceding pages were electrotyped, the paper by Professor J. 

 B. Smith, on the maxillary tentacles of Pronuba, referred to on p. 222, 

 has been printed in Insect Life, v. 161, Jan. 1893. 



PRESS OF Nixon-Jonas PEWTIMO Co., 215 PINK STREET, ST. Louis, Mo. 



