238 ENTOMOLOGICAL SOCIETY 



furcals extremely long, the former forming a right angle with the stem, 

 straight for about one-third its length then suddenly bent and slightly 

 undulated near terminus, fourth furcal longer than the third and also 

 longer than the stem, strongly undulated; tip of wing between radius 

 and fourth furcal; second marginal cell reniform in outline .and much 

 larger than the first which is 2j times longer than high. 



r^. Genital plate longer than the genital segment, simple, moderately 

 wide, anterior edge nearly straight, tip very narrowly rounded, posterior 

 edge slightly convex; forceps narrower and nearly one-third lower than 

 the plate, posterior edge straight, anterior edge also straight but near the 

 tip suddenly sinuated, tip appearing as a minute blackish hook which 

 points forward. 



9- Genital segment longer than in E. arctostapkyli, upper plate very 

 gradually narrowed into a straight, moderately acute point; lower plate 

 hardly wider but decidedly shorter than the upper one, gradually nar 

 rowed into an acute point, lower edge gently ascending. 



Described from several specimens collected during the months 

 of July and August by Mr. A. Koebele in Santa Cruz county, 

 Cal., on Arbutus menzicsii. 



Easily distinguished from the preceding by the shorter frontal 

 lobes, the anteriorly convex vertex, the form of the wing, the 

 venation and by the sexual characters. 



Type. No/Si45, U. S. National Museum. 



2. DESCRIPTION OF THE NEST-CONSTRUCTING PSYLLID. 

 {EupJialerus, n. gen. ; nidifex, n. sp.) 



At a previous place in this volume (pp. 1^3-154) a short 

 characterization (accompanied by a figure), will be found of the 

 peculiar habit of the larva of this Psyllid, and the following lines 

 are copied from a description of the perfect insect drawn up by 

 myself in 1887 : 



Euphalerus, n. gen. (subfamily Aphalarinae). 



Body glabrous, stouter than in Psyllopsis or Aphalara but much less 

 so than in Eupliyllura. Head deflexed vertically or nearly so, vertex 

 slightly emarginate posteriorly, not narrowed at the sides, at middle half 

 as long as its width at base, anteriorly slightly obliquely truncate each 

 side of median line; frontal cones present, triangular, contiguous at base, 

 slightly diverging apically, not depressed below the level of the vertex 

 and separated therefrom only by a finely impressed line; antennie very 

 thin but less slender than in Psyllopsis, slightly clavate at tip. 



Surface of thorax very convex longitudinally; pronotum nearly vertical, 

 dorsulum strongly ascending posteriorly, mesonotum longitudinally con 

 vex posteriorly. The transverse convexity of the parts of the thorax is 

 also greater than in 



