IN NEW MEXICO. 13 



NO. vii. THE YUCCA SCALE (LecanocUaspis yuccae Kiley MS.). 



This is a round, hemispherical, whitish scale, about 3 to 4 mm. 

 in diameter, and of hard texture. The scale bears a median longi- 

 tudinal carina or keel above, and is a little narrower than long. 

 This species is also undescribed, and the above manuscript name 

 was furnished by Professor Riley. It can be easily recognized 

 when seen. 



Egg. The eggs under dried scales are pale yellowish or 

 whitish, and a considerable number occur under one scale. 



Food-plants, This scale was found on leaves of DasyUrion 

 tvheeleri, March 14, 1891, in the Organ mountains. It was later 

 found on the large-leaved yuccas (probably Yucca macrocarpa), in 

 the same mountains. In both plants, it infests the upper side of 

 the leaves very plentifully, chiefly at and near their bases. These 

 plants are highly ornamental, and the yuccas especially may be 

 used to advantage on lawns. Therefore this scale becomes of con- 

 siderable importance from an economic standpoint. 



Parasites. Some of the scales which have been collected were 

 found infested with a hymenopterous parasite, the black perfect in- 

 sect of which could be seen inside the scale through a small round 

 hole where it was about to emerge. 



NO. vin. THE LARREA SCALE (Signoretia sp. ? ). 



This scale is enclosed in a white felted or cottony covering. The 

 insect itself is of a light reddish-brown, with the legs and antennae 

 concolorous. The adult female has apparently 8 joints in the anten- 

 nae, and the legs are present. The first antennal joint is short. The 

 larva has only six antennal joints. The dimensions are as follows: 

 Length of adult female, about 4 mm ; width, 2 mm. Length of 

 felted sac, 5 to 6 mm; width, 2 to 2.5 mm. 



Egg. The eggs are whitish in color and are enclosed in the 

 end of the felted sac, behind the body of the female, the head of the 

 female being usually more or less thrust through the anterior end of 

 the sac. 



