160 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



other trophi also identical with those found in insects with biting 

 mouth parts, and even maxillulse lobes on hypopharynx (fig. 37), 

 proves the Micropterygidse a much more ancient group than the 

 Eriocranidse, which possess none of these characteristics but has 

 a true sucking mouth. 



In the Micropterygidse the maxillae consist of a well developed 

 cardo and stipes (figs. 36-37), a palpiger which carries the six- 

 jointed palpus, and a subgalea which carries a distinct, well chiti- 

 nized lacinia with a few setae, and a two-jointed galea, the basal 

 joint of which is short and well chitinized, while the terminal 

 joint is soft and leaf-shaped, with a longitudinal series of seise. 



The Eriocranidse (figs. 29-30), also possess distinct cardo and 

 stipes, as well as a six-jointed palpus, and the galea is also two- 

 jointed, but they lack altogether the lacinia, and the terminal 

 joint of the galea is developed into one of the hollow sheaths of a 

 true proboscis, is curved, has the typical serrations (figs. 25-26), 

 which serve to connect it with the other half of the proboscis, 

 and has the usual parallel ring structure and surface cilia placed 

 in transverse lines. 



Both the Micropterygidse and the Eriocranidse possess a labium 

 with a well developed, three-jointed palpus, the apical joint with 

 the usual sensitive groove, 1 represented merely by a depression 

 containing the rows of sensitive cones. But in tlie Microptery- 

 gidse is found a setae-bearing lobe, corresponding to the galea of 

 the maxillae, issuing from the so-called basal joint of the palpus, 

 which should rather be interpreted as stipes labii. Of this setae- 

 bearing lobe there is no vestige in the Eriocranidse. Finally, 

 only the Micropterygidse, as already mentioned possess the two 

 maxillulae lobes, lateral to the hypopharynx. 2 



The authors are under great obligations to their friend Rev. -I. 

 DeGryse, for the several excellent figures (1, 2, 3, 4, '5, 6, 7, S. 

 9, 10, 11, 15, 19, and 21), of the larval and pupal structures, which 

 he has studied most diligently and carefully, thus contributing 

 very considerably to the value of this paper. 



The other figures, except the venation, were drawn by Adam 

 Boving. 



vol. 29, p. 636, 1895) and by Francis X.Williams, (A New Eriocrania from 

 the Pacific Coast, Ent. News, p. 14, 1908). 



1 Pointed out by O. Von Rath: Zool. Anzeiger 1887, p. 627; Zeitschrift 

 f. Wissench. Zoolpgie, Bd. 46, 1888. 



2 These investigations of the maxillary, labial, and maxillulary struc- 

 tures fully substantiate the writings of Dr. Walter, who has already pointed 

 out most of the above mentioned characters in his excellent paper. In the 

 middle of the hypopharynx is plainly seen in our slides, both of the Microp- 

 terygidse and the Eriocranidse, the opening of the salivary glands, which 

 \\ alter was not able to discern on account of the condition of his material. 



