172 Eighteenth Report State Entomologist of Minnesota — 1920 



tylus, spot on lorae, basal angles of juga, arcuated streak each side of front, 

 basal margin of vertex, pale. Rostrum, length 2.51 mm., reaching to middle 

 of hind coxae, piceous. 



Antennae: segment I, length .48 mm., black; II, 1.68 mm., more slender 

 on basal half and gradually enlarged toward apex, nearly attaining thickness of 

 segment I, pubescence infuscated, length of exserted hairs greater than thick- 

 ness of segment, black, more brownish on the basal one-third; III, .63 mm.; 

 IV, .57 mm. ; last two segments blackish. 



Pronotuni : length 1.54 mm., width at base 2.45 mm., anterior angles 1.03 

 mm. ; collar .85 mm., black, opaque ; disk and calli black, slenderly pale at basal 

 margin, in paler forms the disk may be fusco-grayish between the punctures ; 

 lateral margins more nearly straight and the anterior angles more sharply de- 

 fined than in nigritulus; propleura black, lower margins pale; xyphus nearly 

 flat, pale, a dark mark at anterior angles. Scutcllum moderately convex, shin- 

 ing, longly pale pubescent, black, basal angles and apex pale ; mesoscutum mod- 

 erately exposed, black, pubescent. Sternum and pleura black, opaque ; ostiolar 

 peritreme pale, infuscated at dorsal margin, sometimes tinged with reddish. 



Hemelytra: width 2.9 mm., structurally very similar to nigritulus; fuscous 

 to black, black color spreading from the punctures, clavus and basal half of 

 embolium and spot on corium paler between the punctures, not stained with 

 brown as in nigritulus, apical half of corium and apex of clavus piceous. 

 C uncus black, paler between punctures on basal half. Membrane heavily in- 

 fuscated on the apical half, a ray projecting basally between the areoles, veins 

 and slightly invading the membrane either side dark fuscous, the paler areas 

 bordering the brachium and within the areoles fumate. 



Legs: dark brownish black, in paler forms the hind tibiae indistinctly an- 



nulated with paler on the apical half; hairs on tibiae less prominent than in 



yiigritulus: structure of claws and arolia very similar to those of nigritulus. 



Venter: black, shining, dusky 



pubescent; genital claspers (fig. 



2)3) distinctive of the species, 



closely related to nigritulus but 



exhibiting specific differences. 



9. Length 7.1 mm., width 3.1 



^,^ „ , mm.; very similar to the male 



OJO/gu/US . , A \ . TT 



-/ m form and color; segment 11, 



Fig 33. DeratworJ.s albigidus, male geni- length' 1.94 mm., slender, thick- 

 tal claspers. a, left clasper, lateral aspect ; 



b, internal arm of left clasper ; c, right clasp- ened On the apical one-f Ourth but 



er, lateral aspect. , , , ■ • ,, .1 • i 



scarcely attammg the thickness 



of segment I, pubescence infuscated, length of exserted hairs about equal to 

 twice greatest thickness of segment, fusco-brownish, the apical one-fourth black. 

 Holotypc: 6 June 30, Ithaca, New York (H. H. Knight; author's 

 collection. Allotype: taken with the type on Pinits sylvcstris. Para- 

 fypcs: INDIANA,— 2 <? 19 June 27,' 9 July 4, ^^liller (W. J. Ger- 

 hard). MICHIGAN,— 32 June, Huron Mt. Club, Lake Superior (H. 

 G. Barber). 1 <? 19 July 30, Marquette. NEW YORK,— 9 June 22, 

 29 June 30, 29 July 8. Ithaca (H. H. Knight), taken on Piiiits sylvcs- 

 tris. 



