Top 20 Most Common Insects in Palo Alto

Adelpha eulalia belongs to the serpa species group in the genus Adelpha (sisters). It was previously treated as a subspecies of Bredow's sister (Adelpha bredowii). Recent phylogenetic studies, however, conclude that morphological, geographical, and genetic evidence make it clear that it is a separate species.

Male flame skimmers are known for their entirely red or dark orange body, this includes eyes, legs, and even wing veins. Females are usually a medium or darker brown with some thin, yellow markings. This particular type of skimmer varies in size but is generally measured somewhere between 5 cm and 8 cm long. These naiads are known for being rather large and chubby-looking due to their rounded abdomen. They are covered with hair but, unlike most young dragonflies, they lack hooks or spines.

Often confused for the ladybug, multicolored asian ladybeetle (Harmonia axyridis) is a separate species that, unlike the ladybug, is a household pest. It is considered particularly annoying for its habit of returning to places from which it is removed. One of the most variable species in the world, there are many different colors and patterns multicolored asian ladybeetle may display, making identification potentially difficult.

The striped shore crab spends half of its time out of the water, usually hiding in small cracks among rocks. It is well adapted to semi-terrestrial life and said to be able to thrive on land for up to 70 hours. When night falls and its predators are not active, the the striped shore crab emerges out from rock cervices, seeking food.

The fiery skipper (Hylephila phyleus) is a butterfly of the family Hesperiidae and is approximately 1 inch (2.5 cm) long. The males are orange or yellow with black spots while the females are dark brown with orange or yellow spots. The caterpillars are greenish pink with a black head. The caterpillars are often considered pests and can feed on Bermudagrass, creeping bentgrass, and St. Augustine grass. Fiery skippers, along with all other species of skippers and skipperlings, can hold their wings in a "triangle" shape. The forewings are held upright, and the hindwings are folded flat. This position is thought to better absorb the sun's rays. The fiery skipper lives in North and South America, from Canada to Argentina. It is a migratory species.

Bombus melanopygus is a non-woven insect from the family of bees and bumblebees (Apidae). The scientific name of the species was first validly published in 1848 by Nylander.

It is a large, brightly colored and active butterfly, rarely seen at rest; its wingspan is 8 - 10 cm, and its wings are yellow with black stripes, and it has blue and orange spots near its tail. It has the "tails" on the hindwings that are often found in swallowtails. The eggs are deep green, shiny, and spherical. Young caterpillars resemble bird droppings, and as they molt, they eventually turn bright green, with a pair of large yellow eyespots with black and blue pupils. The caterpillars molt five times, eventually reaching a length up to 5 cm before pupating.

The winter Ant (Prenolepis imparis), also called the "winter ant", is most active during cool weather. While other pests are inactive, this ant comes out to forage, and it's aggressive toward any bugs that get in its way. This species' nests are found deep in the ground, oftentimes deeper than the height of a human.

A particularly hated invasive species in North America, european paper wasp (Polistes dominula) is well-known for its tendency to nest on human porches and sting if approached. Nests are controlled by a dominant female queen, who lays most of the eggs. Dominance among individuals can be predicted by the shape, size and number of spots they display, with more spots signaling greater dominance within the nest.