]30 FAMILY EVANIID^. 



sometimes thickened, [)articularly in Semwomyia, where it is strongly 

 incrassated beyond the middle, see Fig. 55. The forehead is more 

 or less convex in Hyptiini, but in Evaniinse it is concave, forming 

 a distinct basin in which the two antennae are inserted, and this is 

 bordered below and usually laterally by a distinct carina or rim. 



I have studied the mouth-parts from glycerine mounts of all the 

 genera but two (PI. VIII), and find that the maxillary palpi are 

 5 jointed, the palpiger distinct, and the labial palpi usually 4-jointed, 

 in Hyptia 3 jointed (Fig. 37). In Evania and especially in Hyptia 

 the third joint of the labial palpi is strongly inflated, and sub-tri 

 angular (Figs. 28 and 29) ; the labium in Evania is broadly oval, 

 highly chitinized and conceals the rather short ligula; this is also 

 true in Hyptia, but in that genus the labium is broader, rather pear- 

 shaped ; in Acanthinevania (Figs. 26) it consists of two narrow 

 chitinized plates, which do not conceal the long lingula ; in Evani- 

 ella (Fig. 35) the arrangement is similar, but the labium is a little 

 broader; in Szepligetella the ligula is long, but the labium broad 

 as in Evania. 



The neck is short, shorter than in Aulacinse and much shorter 

 than in Foeninse, so that the head normally covers the collar or pro- 

 notum (Fig. 18). If we remove the head and look at the thorax 

 from in front (Fig. 19), we will see the pronotum as an irregular 

 transverse piece forming the upper and side margin of the cavity 

 vacuated by the neck, extending down laterally in a narrow point 

 almost to the coxae (Fig. 19). The upper margin is more or less 

 arcuate, sometimes nearly straight and extends back below the 

 raesonotum to the tegulse. The shoulders, spoken of as the humeral 

 angles (Fig. 19), may be entirely rounded, or sharply angled, and 

 this character is very useful in classification. Below the cavity of 

 the neck, and somewhat depressed, are two oval sclerites, which rep- 

 resent the propleurie (Fig. 19), and adjoin the procoxa) below; the 

 latter are in juxtaposition (Fig. 19). 



If we examine the dorsum from above we will .see the mesonotum 

 as a large piece, rounded in front and extending backward to behind 

 the anterior wings, where a straight transverse suture separates it 

 from the scutellum. The latter is indistinct in North American 

 Hyptiae, so that the mesonotum and scutellum superficially aj)pear 

 as one piece. The mesonotum is of varying degrees of convexity, 

 but never gibbous, as in Aulacinie. The maximum number of 



