March, 1920.] DiCKERSOX & WeISS : EvEXIXG PrIMROSE IxSECTS. 61 



Haltica marevagans Horn. 



This blue flea beetle occurs throughout New Jersey but is most 

 abundant in the southern part. It feeds during both larval and 

 adult stages on the foliage of primroses, skeletonizing the leaves 

 from either the upper or lower surfaces. 



Egg. — Length 1.2 mm. Width 0.4 mm. Subcylindrical, obtusely 

 rounded at both ends. Color buff when first laid, becoming darker 

 yellow and finally orange yellow just before hatching. Many eggs 

 streaked lengthwise with a thin line of dark excrement. Outer sur- 

 face of chorion sculptured with slight subcircular, contiguous de- 

 pressions with slightly tuberculate elevations between them. 



Full Grown Larva. — Length 5.8 mm. Width 1.7 mm. Ground 

 color olive to dark olive, which with dark tubercles cause some larvae 

 to appear almost black. Subcylindrical, somewhat flattened ven- 

 trally, tapering at both ends. Body surface finely shagreened, bear- 

 ing many tuberculous spots of varying shapes and sizes, som". of 

 which bear one and others two bluntly tipped hairs. Antennae short. 

 Head rounded, lobes moderately constricted posteriorly; front with 

 a median, shallow depression. Color shining black except for a 

 narrow lateral spot including and dorsal to each antenna. Head 

 bearing several hairs on front and sides. Thoracic plate covering 

 dorsal surface of prothorax which bears a single lateral spot. Tho- 

 racic plate is of same ground color as other tuberculous spots. Fine 

 median line divides thoracic plate and continues through median, 

 dorsal tuberculous spots of meso- and metathorax. Median dorsal 

 spots of meso- and metathorax similar to those of abdominal seg- 

 ments. Lateral to each of these is a single spot of which the pos- 

 terior one is much the larger. Below these spots is a longitudinally 

 elongated, spiracular spot and below this a pair of spots. Each 

 abdominal segment beginning with the first bears two transversely 

 elongated, median, dorsal spots placed one behind the other, of which 

 the anterior is the longer. Lateral to each of these on each side are 

 two somewhat more circular spots thus forming two transverse rows 

 of tuberculous spots on the dorsal surface. Below this double row 

 on either side is a tuberculous spot containing the spiracle, below 

 which are two other spots arranged transversely. On the last ab- 

 dominal segment, the spots are united so as to form single dorsal 

 and ventral spots. On each ventral abdominal segment is an elon- 



